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{{Infobox iPhone
| name = iPhone 4
| logo = [[File:IPhone 4 logo.svg|150px]]
| image = [[File:IPhone 4 in hand.jpg|iPhone 4|275px]]
| caption = An iPhone 4 displaying [[SpringBoard]]
| developer = [[Apple Inc.]]
| manufacturer = [[Foxconn]] ([[Original equipment manufacturer|OEM]])<ref>{{cite web
| last = Dalrymple
| first = Jim
| title = iPhone manufacturer to pay family of dead worker
| url = http://news.cnet.com/8301-13579_3-10297254-37.html
| work = [[CNET Networks{{!}}CNET.com]]
| accessdate = 18 July 2010
| date = 28 July 2009}}</ref>
| slogan = This changes everything. Again.<ref>{{cite web
| last = Grove
| first = Zach
| title = iPhone 4: This Changes Everything.... Again
| url = http://www.associated-content.com/article/5468684/iphone_4_this_changes_everythingagain.html
| work = [[Associated Content]]
| accessdate = 18 July 2010
| date = 12 June 2010}}</ref>
| form = [[Touchscreen mobile device|Slate]] [[smartphone]]
| generation = [[List of iOS devices#iPhone|4]]
| releasedate = 24 June 2010{{Ref label|A|a|none}}
| available =
| price = <!-- this is the price at initial release on non-contract in native country, i.e. United States of America, not the current price -->
| status = <!-- if the model is discontinued, please use "Discontinued", otherwise, please leave black -->
| unitssold = 14.1 million<ref>{{cite web
| title =Apple Reports Fourth Quarter Results
| url = http://www.apple.com/pr/library/2010/10/18results.html
| publisher = [[Apple Inc.]]
| accessdate = 22 October 2010
| date = 18 October 2010}}</ref>
| unitsshipped =
| media =
| os = [[iOS (Apple)|iOS]] [[IPhone OS version history#current|4.2.1]] (build 8C148) <br /> Released {{release date|2010|11|22}}
| power = Built-in rechargeable [[Lithium-ion polymer battery|Li-ion battery]] <br /> 3.7 [[Volt|V]] at 1420 [[Ampere-hour|mAh]]<ref>{{cite web
| title = iPhone 4 Teardown
| url = http://www.ifixit.com/Teardown/iPhone-4-Teardown/3130/1
| work = [[iFixit]]
| accessdate = 18 July 2010
| page = 1
| page = 4
| date = 23 June 2010}}</ref>
| cpu = [[Apple A4]] ([[ARM architecture|ARM Cortex-A8]])<ref name="A4 Clock Speed">{{cite web
| title = iPhone 4 Teardown
| url = http://www.ifixit.com/Teardown/iPhone-4-Teardown/3130/2
| work = [[iFixit]]
| page = 2
| page = 4
| accessdate = 23 June 2010}}</ref>
| gpu = [[Apple A4]] ([[Intel Consumer Electronics|PowerVR SGX 535]])<ref name="A4 Clock Speed"/>
| storage = 16 [[gigabyte|GB]] or 32 GB [[flash memory]]
| memory = 512 [[Megabyte|MB]] [[eDRAM]]<ref>{{cite web
| title = Apple reveals iPhone 4 has 512MB RAM, doubling iPad
| url = http://www.ifixit.com/Teardown/iPhone-4-Teardown/3130/1
| work = [[AppleInsider]]
| last = Lane
| first = Slash
| accessdate = 17 June 2010
| date = 17 June 2010}}</ref>
| display = 3.5-inch (89 mm) diagonal 1.5:1 aspect ratio widescreen <br /> [[LED backlit]] [[TFT LCD#In-plane switching|IPS TFT LCD]] ''Retina display'' <br /> 960-by-640-[[pixel]] [[Image resolution|resolution]] at 326 [[Pixel density|ppi]] (0.61 Megapixels)<br /> 800:1 [[contrast ratio]] (typical) <br /> 500 [[Luminance|cd/m2]] max brightness (typical) <br /> [[Fingerprint]]-resistant [[Lipophobicity|oleophobic]] [[coating]] on front and back glass
| audio = Single [[loudspeaker]] <br /> 3.5 mm [[TRS connector|TRRS]] <br /> [[Frequency response]]: 20 [[Hertz|Hz]] to 20,000 Hz
| input = [[Multi-touch]] [[touchscreen]] display <br /> [[iPhone#Audio and output|Push-buttons]] <br /> Dual [[microphone]] <br /> 3-axis [[gyroscope]] <br /> 3-axis [[accelerometer]] <br /> [[Magnetometer|Digital]] [[compass]] <br /> [[Proximity sensor|Proximity]] sensor <br /> [[Photodetector|Ambient light]] sensor
| rear_camera = 5 [[megapixel|MP]] [[backside illumination|back-side illuminated sensor]] <br /> [[High-definition video|HD video]] ([[720p]]) at 30 [[frame rate|fps]] <br /> 1.75 [[Micrometre|μm]] [[Pixel density|size pixels]] <br /> 5× [[digital zoom]] <br /> Tap to focus video or still images <br /> [[Light-emitting diode|LED]] [[Flash (photography)|flash]] <br /> Photo and video [[geotagging]]
| front_camera = .3 MP ([[Video Graphics Array|VGA]]) <br /> [[Standard-definition television|SD video]] ([[480p]]) at 30 fps <br />25.17 [[Micrometre|μm]] [[Pixel density|size pixels]] <br /> Tap to focus video or still images <br /> Photo and video geotagging
| connectivity = [[Multi-band|Quad-band]] [[GSM]]/[[General Packet Radio Service|GPRS]]/[[Enhanced Data Rates for GSM Evolution|EDGE]] <br /> ([[GSM frequency bands|800 850 900 1800 1900]] [[Hertz|MHz]])<br /> [[Multi-band|Quad-band]] [[Universal Mobile Telecommunications System|UMTS]]/[[High-Speed Downlink Packet Access|HSDPA]]/[[High-Speed Uplink Packet Access|HSUPA]] <br /> ([[UMTS frequency bands|800 850 900 1900 2100]] [[Hertz|MHz]]) (800 MHz not yet announced as supported by Apple) <br /> [[Wi-Fi]] ([[IEEE 802.11|802.11]] [[IEEE 802.11b-1999|b]]/[[IEEE 802.11g-2003|g]]/[[IEEE 802.11n-2009|n]]) {{nowrap|(2.4 [[Hertz|GHz]] only)}} <br /> [[Bluetooth#Bluetooth v2.1 + EDR|Bluetooth 2.1 + EDR]]
|| service = [[App Store]], [[iTunes Store]], [[iBookstore]], [[MobileMe]]
| dimensions = {{convert|115.2|mm|in|abbr=on}}&nbsp;''(h)''<br>{{convert|58.66|mm|in|abbr=on}}&nbsp;''(w)''<br>{{convert|9.3|mm|in|abbr=on}}&nbsp;''(d)
| weight = {{convert|137|g|oz|abbr=on}}
| predecessor = [[iPhone 3GS]]
| successor =
| related = [[iPad]], [[iPod Touch]] ([[List of iOS devices|comparison]])
| website = [http://www.apple.com/iphone/ Apple – iPhone]
}}
The '''iPhone 4''' is a [[Touchscreen mobile device|slate]] [[smartphone]] developed by [[Apple Inc.|Apple]]. It is the [[List of iOS devices#iPhone|fourth generation]] of [[iPhone]], and successor to the [[iPhone 3GS]]. It is particularly marketed for [[videotelephony|video calling]], consumption of media such as books and periodicals, movies, music, and games, and for general web and e-mail access. It was announced on June 7, 2010, at the [[WWDC#WWDC 2010|WWDC 2010]] held at the [[Moscone Center]], [[San Francisco]],<ref name = "Live WWDC 2010 - Engadget">{{cite web
| last = Topolsky
| first = Joshua
| title = Steve Jobs live from WWDC 2010
| url = http://www.engadget.com/2010/06/07/steve-jobs-live-from-wwdc-2010/
| work = [[Engadget]]
| accessdate = 18 June 2010
| date = 7 June 2010}}</ref> and was released on June 24, 2010 in the United States, the United Kingdom, France, Germany and Japan.

The iPhone 4 runs Apple's [[iOS (Apple)|iOS]] operating system, the same operating system as used on previous iPhones, the [[iPad]], and the [[iPod Touch]]. It is primarily controlled by a user's fingertips on the [[multi-touch]] display, which is sensitive to fingertip contact.

The most noticeable difference between the iPhone 4 and its predecessors is the new design, which incorporates an [[electrical insulation|uninsulated]] [[stainless steel]] frame that acts as the device's antenna. The internal components of the device are situated between two panels of chemically strengthened [[aluminosilicate]] [[glass]].<ref name = "Definitive Guide"/> It has an [[Apple A4]] processor and 512&nbsp;[[Megabyte|MB]] of [[eDRAM]], twice that of its predecessor and four times that of the [[original iPhone]]. Its {{convert|3.5|in|mm|sing=on}} [[LED backlit]] [[liquid crystal display]] with a 960×640 pixel resolution is marketed as the "[[Retina display|Retina Display]]".

Some iPhone 4 buyers have reported signal reduction when the phone is held in certain ways, especially in the left hand, as the antenna problem is in the bottom left corner of the phone's side casing. The company has offered all customers a free case until September 30, 2010, or a refund within 30 days of purchase, as cases have been shown to correct this antenna problem.<ref>Taylor, Lesley Ciarula. [http://www.thestar.com/article/836734--steve-jobs-promises-iphone-refunds-free-cases "Steve Jobs promises iPhone refunds, free cases"], ''The Toronto Star'', July 16, 2010.</ref> After this date, customers suffering these problems will still be supplied a free case (at Apple's discretion), by calling AppleCare.<ref>Dalrymple, Jim [http://www.loopinsight.com/2010/09/10/apple-to-discontinue-free-iphone-bumper-case-program-on-sept-30/ "Apple to discontinue free iPhone Bumper Case program on Sept. 30"], ''The Loop'', September 10, 2010.</ref>

The latest operating system release, iOS 4.2.1, added functionality such as [[AirPrint]], and [[AirPlay]].<ref>http://www.pcworld.com/businesscenter/article/211670/readers_sound_off_best_new_ios_42_features.html</ref>

==History==
{{Further|[[History of the iPhone]]}}

===Prototypes===
<!--Legal note: This section originally developed at [[iPhone]] and was moved to [[History of the iPhone]] prior to placement here -->
Prior to the official unveiling of the iPhone 4 on June 7, 2010, two prototypes were brought to the attention of the media, breaching Apple's normally secretive development process. Many of the speculations regarding technical specifications proved accurate.

====Gizmodo====
On April 19, 2010, gadget website [[Gizmodo]] reported that they had purchased an iPhone prototype for $5000, and furthermore, had conducted a [[product teardown]] of the device. The prototype is reported to have been lost by an Apple employee, [[Gray Powell]], in [[Redwood City, California|Redwood City]], [[California]].<ref>{{cite web
| last = Golijan
| first = Rosa
| title = The Tale of Apple's Next iPhone
| url = http://gizmodo.com/5520471/the-tale-of-apples-next-iphone
| work = [[Gizmodo]]
| accessdate = 18 June 2010
| date = 23 April 2010}}</ref> Shortly after Gizmodo published detailed information about the prototype, Apple's legal associates formally requested for the phone to be returned to Apple, and Gizmodo responded with the intent to cooperate.<ref>{{cite web|url=http://gizmodo.com/5520479/a-letter-apple-wants-its-secret-iphone-back|title=A Letter: Apple Wants Its Secret iPhone Back|first=Brian|last=Lam|date {{Start date|2010|04|19}}|publisher=[[Gizmodo]]|accessdate={{Start date|2010|06|18}}}}</ref> On April 22, officers from the Rapid Enforcement Allied Computer Team (REACT) task force of the [[California]] [[High Technology Theft Apprehension and Prosecution Program|HTTAP Program]] raided the home of Jason Chen, the Gizmodo editor responsible for reviewing the prototype, seizing all of his computers and hard drives.<ref>{{cite web| url = http://news.cnet.com/8301-13579_3-20003446-37.html| title = Police seize Gizmodo's computers in iPhone probe|author = Sandoval, Greg; McCullagh, Declan| date = {{Start date|2010|04|26}}|publisher=[[Gizmodo]]|accessdate={{Start date|2010|06|18}}}}</ref> The [[Electronic Frontier Foundation]] criticized the raid as violating journalist source protection laws that forbid the seizure of journalist computers as well as the suspicion that Apple had used its influence as a member of the steering committee which is charged with direction and oversight of the California REACT task force to push police into action in a way that would not normally be conducted for this type of incident. Apple had already received the iPhone prototype prior to the raid when it was returned by Gizmodo.<ref>{{cite web| url = http://www.eff.org/deeplinks/2010/04/gizmodo-search-warrant-illegal| title = OverREACTing: Dissecting the Gizmodo Warrant| first = Matt| last = Zimmerman| date={{Start date|2010|04|27}}|publisher=[[Electronic Frontier Foundation]]|accessdate={{Start date|2010|06|18}}}}</ref> The [[District Attorney]] has stated that the investigation has been suspended, and discontinued searching through the Gizmodo editor's belongings as they determine whether the shield laws are applicable, and cautioned that no charges have been issued at this point.<ref>{{cite web|url=http://www.wired.com/threatlevel/2010/04/iphone-finder/|title = iPhone Finder Regrets His ‘Mistake’|author = Chen, Brian; Kim Zetter|date={{Start date|2010|04|29}}| publisher = [[Wired (magazine)|Wired]]|accessdate={{Start date|2010-06-18}}}}</ref><ref>{{cite news| url = http://www.nytimes.com/2010/05/03/business/media/03carr.html|title = A Lost iPhone Shows Apple’s Churlish Side|first = David|last = Carr| date = {{Start date|2010|05|02}}|publisher=The New York Times|accessdate={{Start date|2010|06|18}}}}</ref>

====Taoviet====
Pictures and video of a second prototype were published on a Vietnamese website, Taoviet, on May 12, 2010.<ref>{{cite web|url= http://www.mercurynews.com/ci_15072831?source%253Dmost_viewed.20F88DA3D7D369F5BB70F372987EAE1F.html&nclick_check=1|title = Another next-generation iPhone surfaces, this one in Vietnam| first = Troy|last = Wolverton|date={{Start date|2010|05|13}}| publisher = [[San Jose Mercury News|Mercury News]]|accessdate={{Start date|2010|06|18}}}}</ref> It was almost identical to the first, and used an A4 chip manufactured by Apple.<ref>{{cite web|url = http://gizmodo.com/5536912/another-lost-iphone-4-shows-new-details|title = Another Lost iPhone 4 Shows New Details|first=Jesus|last = Diaz
|date = {{Start date|2010|05|12}}| publisher = [[Gizmodo]]|accessdate={{Start date|2010|06|18}}}}</ref> The website purchased the prototype for $4,000.<ref>{{cite web|url = http://www.engadget.com/2010/05/12/next-generation-iphone-escapes-in-vietnam/|title=Next generation iPhone unscrewed from Vietnam|first=Thomas|last=Ricker| date = {{Start date|2010|05|12}}|publisher = [[Engadget]]|accessdate = {{Start date|2010|06|18}}}}</ref> DigiTimes reported that the screen resolution of the new phone was 960-by-640, which was confirmed by Apple at the iPhone 4's official announcement.

===Release===
The iPhone 4 was made available for pre-order on 15 June 2010. Customers attempting to pre-order the iPhone 4 reported problems with the pre-order process on the [[U.S.]] and [[U.K.]] online [[Apple Store (online)|Apple Stores]] which [[Crash (computing)#Website server crashes|crashed]] due to the surge in traffic.<ref>{{cite news
| last = Beaumont
| first = Claudine
| title = Apple iPhone 4: Pre-orders break records despite technical issues
| url = http://www.telegraph.co.uk/technology/apple/7833362/Apple-iPhone-4-Pre-orders-break-records-despite-technical-issues.html
| accessdate = 18 July 2010
| newspaper = [[The Daily Telegraph]]
| date = 16 June 2010
| location=London}}</ref> The same issue was reported with [[AT&T]] and [[SoftBank]], Apple's exclusive partners in the United States and [[Japan]] respectively, who suspended advance sales of the iPhone 4 as demand threatened to exceed supply.<ref>{{cite web
| last = Patel
| first = Nilay
| title = 600,000 iPhone 4s pre-ordered, Apple apologizes for issues
| url = http://www.engadget.com/2010/06/16/600-000-iphone-4s-pre-ordered-apple-apologizes-for-issues/
| work = [[Engadget]]
| accessdate = 18 July 2010
| date = 16 June 2010}}</ref> Retail stores were also unable to complete pre-order transactions due to the servers crashing.<ref>{{cite web
| last = Murph
| first = Darren
| title = iPhone 4 pre-orderers overwhelm servers, world on the brink of ending
| url = http://www.engadget.com/2010/06/15/iphone-4-pre-orderers-overwhelm-servers-world-on-the-brink-of-e/
| work = [[Engadget]]
| accessdate = 18 July 2010
| date = 5 June 2010}}</ref> Apple and its partner carriers received 600,000 pre-orders for the iPhone 4 in the first 24 hours, the largest number of pre-orders Apple has received in a single day for any device.<ref>{{Cite press release
| title = Statement by Apple on iPhone 4 Pre-Orders
| url = http://www.apple.com/pr/library/2010/06/16iphone.html
| publisher = [[Apple Inc.]]
| accessdate = 23 June 2010
| date = 16 June 2010}}</ref> ''[[Engadget]]'' reported that at 20:30 [[Coordinated Universal Time|UTC]], all iPhone 4 pre-order suppliers had sold out.<ref>{{cite web
| last = Ziegler
| first = Chris
| title = AT&T sold out of iPhone 4 pre-orders for launch day
| url = http://www.engadget.com/2010/06/15/atandt-sold-out-of-iphone-4-for-launch-day/
| work = [[Engadget]]
| accessdate = 18 July 2010
| date = 15 June 2010}}</ref> 1.7 million iPhone 4s were sold in its first three days of availability.<ref>{{Cite press release
| title = iPhone 4 Sales Top 1.7 Million
| url = http://www.apple.com/pr/library/2010/06/28iphone.html
| publisher = [[Apple Inc.]]
| accessdate = 18 July 2010
| date = 28 June 2010}}</ref>

On 24 June 2010, Apple issued a statement that the white iPhone 4 models were proving more "challenging to manufacture" than expected, and pushed the release date back to the second half of July, although {{As of|2010|12|lc=on}}, the white iPhone 4 has yet to be released. According to Apple representatives, the white iPhone 4 should be released by Spring of 2011.<ref>{{Cite press release.
| title = Apple delays white iPhone until next spring
| url = http://www.reuters.com/article/idUSTRE69P59W20101026
| publisher = [[Apple Inc.]]
| accessdate = 26 October 2010
| date = 26 October 2010}}</ref>
There has been much speculation surrounding the reasons for Apple's decision to further delay the release of the white iPhone 4. Among the most popular rumors are those concerning the phone's internal camera being adversely affected by light leaking in due to the semi-translucent glass and the white paint. Other sources report that the problem relates to Apple's inability to match the white color of the front face plate with that of the home button.[http://news.cnet.com/8301-31021_3-20020819-260.html?tag=mncol;6n]

The iPhone 4 has also been released through [[Orange (telecommunications)|Orange]] in Tunisia and was available in 8 cities at the launch.<ref><http://iphone.orange.tn/outrouveriphone-orange.html></ref> In [[South Korea]], it was released by KT in September 10. In [[Israel]], it was released, too, on September 24, through [[Cellcom (Israel)|Cellcom]], [[Pelephone]] and [[Partner Communications Company|Orange]]. It was launched in [[Thailand]] on September 23 by AIS, DTAC and True Move, and in [[Malaysia]] on September 26 in Kuala Lumpur, and nationwide on September 27 according to the website of [[Maxis Communications|Maxis]].<ref>{{cite web|url=http://www.maxis.com.my/personal/iphone4/landing.asp |title=iPhone 4 |publisher=Maxis.com.my |date= |accessdate=2010-11-11}}</ref> The iPhone 4 was released in [[South Africa]] on [[September 22]] on the [[Vodacom]] and [[MTN]] networks, in very limited quantities.<ref><http://www.fin24.com/Business/iPhone-4-arrives-in-SA-20100920></ref> The iPhone 4 was launched in [[Vietnam]] on September 30 by VinaPhone and Viettel, at first in 3 major cities: [[Hanoi]], [[Ho Chi Minh city]] and [[Da Nang]], and then all over the country by the end of October.<ref><http://iphone.vinaphone.com.vn></ref><ref><http://iphone.vietteltelecom.vn></ref>

==Hardware==
{{See also|iPhone#Hardware|l1=iPhone Hardware}}

===Display===
The display of the iPhone 4 is designed by [[Apple Inc.|Apple]] and is manufactured by [[LG Display|LG]]. It features an [[LED backlit]] [[Liquid crystal display|TFT LCD]] [[capacitive touchscreen|capacitive]] [[touchscreen]] with a [[pixel density]] of 326 [[pixel density|pixels per inch]] (ppi) on a {{convert|3.5|in|cm|abbr=on}} (diagonally measured), 960×640 display. Each pixel is 78 [[micrometre]]s in width. The display has a [[contrast ratio]] of 800:1. The screen is marketed by Apple as the "Retina Display", based on the assertion that a display of approximately 300 ppi at a distance of {{convert|12|inch|mm|0}} from one's eye is the maximum amount of detail that the human retina can process.<ref>{{cite web
| url = http://www.pcworld.com/article/198201/iphone_4s_retina_display_explained.html
| title = iPhone 4's Retina Display Explained
| first = Chris
| last = Brandrick
| date = {{Start date|2010|06|08}}
| publisher = [[PC World (magazine)|PC World]]
| accessdate = {{Start date|2010|06|18}}}}</ref> With the iPhone expected to be used at a distance of about 12&nbsp;inches from the eyes, a higher resolution would allegedly have no effect on the image's apparent quality as the maximum potential of the human eye has already been met.

This claim has been disputed. [[Raymond Soneira]], president of [[DisplayMate Technologies]], said in an interview with [[Wired (magazine)|Wired Magazine]], that the claims by Jobs are something of an exaggeration: "It is reasonably close to being a perfect display, but Steve pushed it a little too far." Soneira stated that the resolution of the human retina is higher than claimed by Apple, working out to 477 ppi at {{convert|12|inch|mm|0}} from the eyes.<ref>{{cite web
| url = http://www.pcmag.com/article2/0,2817,2364871,00.asp
| title = Analyst Challenges Apple's iPhone 4 'Retina Display' Claims
| first = Mark
| last = Hachman
| date = {{Start date|2010|06|09}}
| publisher = [[PC Magazine]]
| accessdate = {{Start date|2010|06|23}}}}</ref>

However, [[Phil Plait]], author of [[Bad Astronomy]], whose career includes a collaboration with [[NASA]] regarding the camera on the [[Hubble Space Telescope]], responded to the criticism by stating that "if you have [better than 20/20] eyesight, then at one foot away the iPhone 4’s pixels are resolved. The picture will look pixellated. If you have average eyesight, the picture will look just fine."<ref>{{cite web
| url = http://blogs.discovermagazine.com/badastronomy/2010/06/10/resolving-the-iphone-resolution/
| title = Resolving the iPhone resolution
| first = Phil
| last = Plait
| authorlink = Phil Plait
| date = {{Start date|2010|06|10}}
| publisher = [[Discover (magazine)|Discover Magazine]]
| accessdate = {{Start date|2010|06|23}}}}</ref><ref>{{cite web
| url = http://www.engadget.com/2010/06/10/iphone-4s-retina-display-claim-put-under-the-math-microscope/
| title = iPhone 4's retina display claim put under the math microscope
| first = Vlad
| last = Savov
| date = {{Start date|2010|06|10}}
| publisher = [[Engadget]]
| accessdate = {{Start date|2010|06|23}}}}</ref>

===Camera===
[[File:IPhone 4 cameras.png|thumb|right|The iPhone 4 is the first iPhone [[List of iOS devices#iPhone|model]] to have two cameras. The LED flash for the rear-facing camera (top) and the forward-facing camera (bottom, left of speaker) are not present in older models.]]
The iPhone 4 features an additional front-facing [[VGA]] camera, and an improved (backslide-illuminated, big physical pixel size) 5 [[megapixel]] rear-facing camera integrated with an [[LED flashlight|LED]] [[flash (photography)|flash]]. The rear-facing camera is capable of [[camcorder|recording]] [[High-definition video|HD video]] in [[720p]] at 30 [[Frame rate|frames per second]]. Both cameras make use of the ''tap to focus'' feature, part of iOS 4, for photo and video recording.<ref>{{cite web
| url = http://www.macrumors.com/2010/06/08/a-look-at-iphone-4s-camera-quality/
| title = A Look at iPhone 4's Camera Quality
| first = Eric
| last = Slivka
| date = 8 June 2010
| publisher = [[MacRumors]]
| accessdate = 20 June 2010}}</ref> The rear-facing camera has a 5× [[digital zoom]].<!--only photos or video too?-->
The most significant outcome is that Apple is focusing attention on the iPhone 4’s video calling capabilities, apparently making “the dream of video calling a reality”.<ref>{{cite web
| url = http://techviewz.org/2010/06/iphone-4-to-start-mobile-video_06.html
| title = Iphone 4 to start Mobile video convergence
| date = 8 June 2010
| publisher = TechViewz.Org
| accessdate = 6 October 2010}}</ref>

===Connectivity===
In contrast to Steve Jobs' announcement at WWDC 2010, recent [[Federal Communications Commission]] documentation has shown that the iPhone 4 contains a [[Multi-band|Penta-Band]] [[3G]] [[Universal Mobile Telecommunications System|UMTS]] antenna, not a [[Multi-band|Quad-Band]] 3G UMTS radio, as advertised by [[Apple Inc.|Apple]]. According to the [[Federal Communications Commission|FCC]] documentation filed by Apple, the radio inside the iPhone 4 supports 800, 850, 900, 1900, and 2100&nbsp;MHz. The 800&nbsp;MHz frequency, which is most commonly used in Japanese mobile phones, is not advertised as being supported by Apple.<ref>{{cite web
| url = http://www.engadget.com/2010/06/07/iphone-4-hits-fcc-becomes-worlds-second-announced-pentaband-3g/2
| title = iPhone 4 hits FCC, becomes world's second announced pentaband 3G phone
| first = Vlad
| last = Savov
| date = 7 June 2010
| publisher = [[Engadget]]
| accessdate = 25 July 2010}}</ref> However, the 800&nbsp;MHz band is a subset of the 850&nbsp;MHz band, which probably explains why the device is advertised as Quad-Band{{Citation needed|date=November 2010}}.

As with many other products manufactured by Apple, the iPhone 4 also uses the [[Dock Connector#Apple 30 pin dock connector|30 pin dock connector]] as its only external data port.

===Gyroscope and accelerometer===
The iPhone 4 introduces a [[Vibrating structure gyroscope|gyroscopic sensor]] that detects 3-axis angular acceleration around the [[Cartesian coordinate system|X, Y and Z axes]], enabling precise calculation of [[yaw, pitch, and roll]]. The gyroscope complements the [[accelerometer]], a sensor that has been present since the [[iPhone (original)|original iPhone]], which detects the device's acceleration, shake, vibration shock, or fall by detecting linear acceleration along one of three axes (X, Y and Z). The combined data from the accelerometer and the gyroscope provides detailed and precise information about the device's 6-axis movement in [[space]]. The 3 axes of the gyroscope combined with the 3 axes of the accelerometer enable the device to recognize approximately how far, fast, and in which direction it has moved in space.<ref>{{cite web
| url = http://www.appleinsider.com/articles/10/06/16/inside_iphone_4_gyro_spins_apple_ahead_in_gaming.html&page=2
| title = Inside iPhone 4: Gyro spins Apple ahead in gaming
| first = Daniel Eran
| last = Dilger
| date = {{Start date|2010|06|16}}
| publisher = [[AppleInsider]]
| page = 2
| pages = 4
| accessdate = {{Start date|2010|06|20}}}}</ref>

===Processor and memory===
The iPhone 4 is powered by the [[Apple A4]] chip, which was designed by [[Intrinsity]]{{Citation needed|date=January 2011}} and, like all previous iPhone models, manufactured by [[Samsung Group|Samsung]].<ref>{{cite web
| url = http://www.pcworld.com/article/198201/iphone_4s_retina_display_explained.html
| title = Apple’s new iPhone 4
| date = {{Start date|2010|06|15}}
| publisher = TechAutos
| accessdate = {{Start date|2010|06|18}}}}</ref> This [[system-on-a-chip]] is composed of a [[ARM architecture|Cortex-A8]] [[central processing unit|CPU]] integrated with a [[Intel Consumer Electronics|PowerVR SGX 535]] [[graphics processing unit|GPU]].<ref>{{cite news
| url = http://www.nytimes.com/2010/02/22/technology/22chip.html
| title = For Chip Makers, the Next Battle Is in Smartphones with better technology

| first = Ashlee
| last = Vance
| date = {{Start date|2010|02|21}}
| publisher = The New York Times
| accessdate = {{Start date|2010|06|19}}}}</ref> The Apple A4 is also used in the [[iPad]] where it is clocked at its rated speed of 1&nbsp;[[GHz]]. The clock speed in the iPhone 4 has not been disclosed . All previous [[List of iOS devices#iPhone|models]] of the iPhone have [[underclock]]ed the CPU, which typically extends battery life and lowers [[CPU power dissipation|heat dissipation]].

The iPhone 4 has 512 MB of [[eDRAM]]. The additional eDRAM supports increased performance and multi-tasking, surpassing the previous limitation of 256 pages of ''straight-up [[Program loops|loops]]''.<ref>{{cite web
| url = http://www.ifixit.com/Teardown/iPhone-4-Teardown/3130/1
| title = iPhone 4 Confirmed to Have 512MB of RAM (Twice the iPad and 3GS)
| first = Arnold
| last = Kim
| date = {{Start date|2010|06|17}}
| publisher = [[MacRumors]]
| accessdate = {{Start date|2010|06|19}}}}</ref>

===Storage and Micro-SIM===
The iPhone 4 uses a [[Subscriber Identity Module|Micro-SIM card]], which is positioned in an ejectable tray, located on the right side of the device. All previous models have used regular Mini-SIM cards. Depending on the operator, Micro-SIM cards may not be available for all networks globally. As a technical workaround it is possible to trim a Mini-SIM card with a knife or scissors so that it fits into the Micro-SIM tray.

As on previous models, all data is stored in [[flash memory]], 16GB or 32GB, and not on the SIM. Unlike previous generations, the storage capacity is not printed on the back of the unit.

==Design==
The iPhone 4 features a redesigned structure, designed by [[Jonathan Ive]]. Most notably, the bulges of the back panel as well as the band between the front and back are gone and have been replaced with flattened surfaces. The redesign reflects the [[Utilitarianism (architecture)|utilitarianism]] and uniformity of existing Apple products, such as the [[iPad]] and the [[iMac]]. The only remnant of the previous generations of iPhone is the general layout of the device; the distinctive metal structure of the iPhone 4 is more reminiscent of the 3G and 3GS. The overall dimensions of the iPhone 4 have been reduced from its predecessor. It is {{convert|4.5|in|mm}} high, {{convert|2.31|in|mm}} wide, and {{convert|0.37|in|mm}} deep, compared to the iPhone 3GS, which is {{convert|4.55|in|mm}} high, {{convert|2.44|in|mm}} wide, and {{convert|0.48|in|mm}} deep; making the iPhone 4 24% thinner than its predecessor, the [[iPhone 3GS]]. [[Steve Jobs]] claims that it is “the thinnest smartphone on the planet".<ref>{{cite news
| title = On Newest iPhone, Another Camera
| url = http://www.nytimes.com/2010/06/08/technology/08apple.html?scp=7&sq=iPhone%204&st=cse
| accessdate = 18 July 2010
| newspaper = [[The New York Times]]
| date = 7 June 2010
| author = Helf, Miguel
| author2 = Wortham, Jenna}}</ref> The reduced size of the device is primarily due to the externally placed antenna.

[[File:Steve Jobs Headshot 2010-CROP.jpg|thumb|right|[[Steve Jobs]], [[Apple Inc.|Apple]] CEO, holding a white iPhone 4.]]

The iPhone 4 is structured around a [[stainless steel]] frame which wraps around the edge of the phone, acting as both the primary structure for the device, and as the iPhone 4's antennas. This metal band features two slits, one at the lower left, and one at the top (and a fake slit along the lower right, to cosmetically mirror the one at the lower left) that divide the band into two antenna sections: the left section of the band serves as the [[Bluetooth]], [[Wi-Fi]], and [[Global Positioning System|GPS]] antenna, and the right and lower sections of the band act as the antenna for [[GSM]] and [[Universal Mobile Telecommunications System|UMTS]] connectivity. The act of touching the gap between the two antennas, at the lower left edge of the phone, with an un-gloved hand, bridges these two separate antennas, sometimes leading to poor signal reception, though usually only in areas with a weak cell tower signal.

The internal components are situated between two panels of [[aluminosilicate]] [[glass]], described by Apple as being "chemically strengthened to be 20 times stiffer and 30 times harder than plastic," theoretically allowing it to be more scratch resistant and durable than the previous models.<ref name = "Definitive Guide">{{cite web
| last = Diaz
| first = Jesus
| title = iPhone 4: The Definitive Guide
| url = http://gizmodo.com/5557101/iphone-4-the-definitive-guide
| work = [[Gizmodo]]
| accessdate = 19 June 2010
| date = 7 June 2010}}</ref>

==Software==
{{See also|iOS (Apple)|l1=iOS}}

===FaceTime===
{{Main|FaceTime}}
The iPhone 4 supports FaceTime, an embedded video calling application that is able to use either the front or back camera over a Wi-Fi connection to communicate with another iPhone 4, the fourth-generation iPod Touch, or any Mac computer running OSX 10.6 Snow Leopard.

==Accessories==
===Bumper===
[[File:Apple iPhone 4 Bumper.jpg|150px|thumb|right|An iPhone 4 next to a Bumper.]]
An iPhone 4 Bumper is a ring of rubber and plastic that surrounds the edge of the iPhone 4. The inner part is rubber with the external band made of plastic. The Bumper wraps around the edges of the device protecting the edges, and to a lesser extent, the screen. The Bumper does not cover the front or rear of the phone, though it does slightly raise the iPhone off whatever surface it is sitting on.<ref name="iPhone 4 Bumper review">{{cite web
| title = Apple iPhone 4 Bumper review
| url = http://www.pcadvisor.co.uk/reviews/index.cfm?reviewid=3232155
| work = [[PC Advisor magazine|PC Advisor]]
| accessdate = 19 July 2010
| date = 16 July 2010}}</ref>

Additionally, the plastic band also houses metallic buttons for the volume controls and sleep/wake button. The six holes in the Bumper enable access to the mute switch, dock connector, earphones speaker and microphone.<ref name="iPhone 4 Bumper review"/>
The bumper also can be used to prevent the "antenna issue" that users face when holding the parts of the steel band where the antennas are, that could cause the phone's signal to drop.

==Technical issues==
Some users have reported a yellow discoloration of the screen, which was attributed to the glass lamination glue that was used. It did not have time to dry fully before the unit reached consumers due to the speed of manufacturing.<ref>{{cite web
| url = http://mobile.venturebeat.com/2010/06/23/iphone-4-problems-crop-up-screen-discoloration-reception-issues-with-antenna-band/
| title = Apple iPhone 4 problems crop up: screen discoloration, reception issues
| first = Devindra
| last = Hardawar
| date = {{Start date|2010|06|23}}
| publisher = [[Glam Media|MobileBeat]]
| accessdate = {{Start date|2010|06|24}}}}</ref> Another issue reported by some users within days of the iPhone 4 release was that during calls the proximity sensor can be insensitive, so that facial contact with the touchscreen can end calls, mute calls, and dial other numbers.<ref>{{cite web
| url = http://www.appleinsider.com/articles/10/06/28/users_report_issues_with_iphone_4_proximity_sensor_during_calls.html
| title = Users report issues with iPhone 4 proximity sensor during calls
| date = {{Start date|2010|06|28}}
| publisher = [[AppleInsider]]
| accessdate = {{Start date|2010|07|07}}
}}</ref>

===Antenna===
Shortly after the iPhone 4 was launched, some consumers reported that signal strength of the phone was reduced when touching the lower left edge of the phone, bridging one of the two locations which separates the two antennas, resulting in dropped calls in some areas with lower signal reception.<ref>{{cite web
| last = Chen
| first = Jason
| title = iPhone 4 Loses Reception When Holding it By Antenna Band?
| url = http://gizmodo.com/5571171/iphone-4-loses-reception-when-you-hold-it-by-the-antenna-band
| work = [[Gizmodo]]
| accessdate = 24 June 2010
| date = 24 June 2010}}</ref><ref>{{cite web
| title = http://www.theage.com.au/digital-life/iphone/iphone-4-fault-fails-to-surface-for-sydney-fans-20100730-10zsp.html
| title = iPhone 4 fault fails to surface for Sydney fans
| date = 2010-07-31
| accessdate = 2010-07-31
| publisher = [[The Age]]
| first = Melissa
| last = Singer}}</ref><ref>{{cite web
| title = Teste de Recepção do iPhone 4
| date = 2010-07-19
| accessdate = 2010-08-09
| publisher = Blog do iPhone
| url = http://www.blogdoiphone.com/2010/07/inedito-teste-de-recepcao-do-iphone-4-com-as-operadoras-brasileiras/
}}</ref> In response, Apple issued a statement advising that customers should "avoid gripping [the phone] in the lower left corner" when making or receiving a call.<ref>{{cite news
| last = Cellan-Jones
| first = Rory
| title = Apple issues advice to avoid iPhone flaw
| url = http://news.bbc.co.uk/1/hi/technology/8761240.stm
| work = [[BBC News]]
| accessdate = 25 June 2010
| date = 25 June 2010}}</ref>

As a consequence of this problem, it was reported on July 2, 2010 that several iPhone 4 users were planning on suing [[Apple Inc.|Apple]] and [[AT&T]] for fraud by concealment, negligence, intentional misrepresentation and defective design. The legal challenge was started by California law firm Kershaw, Cutter and Ratinoff, who set up a website to recruit disenchanted iPhone 4 buyers for a lawsuit against Apple.<ref>{{cite web
| url = http://news.sky.com/skynews/Home/Technology/iPhone-4-Apple-Is-Sued-After-Complaints-Of-Reception-Problems-With-The-New-Smartphone/Article/201007115658175?
| title = iPhone 4: Apple Is Sued After Complaints Of Reception Problems With The New Smartphone
| last = Hewage
| first = Tim
| date = 2 July 2010
| work = [[Sky News]]
| accessdate = 4 July 2010}}</ref><ref>{{cite web
| url = http://news.yahoo.com/s/nm/20100701/tc_nm/us_apple_lawsuits
| title = Consumers sue Apple over iPhone antenna problems
| author = Madway, Gabriel
| author1 = Grenon, Andre
| date = 1 July 2010
| work = [[Yahoo! News]]
| accessdate = 4 July 2010}} {{Dead link|date=October 2010|bot=H3llBot}}</ref> Later that day, Apple issued another statement stating that it had discovered the cause of the "dramatic drop in bars".<ref name = "Statement by Apple on iPhone 4 reception issues"/> Apple explained how the formula it used to calculate the number of bars to display was "wrong". Apple promised to correct the issue and release a software update within a few weeks that would address the "mistake", which had been present since the original [[iPhone (original)|iPhone]].<ref name = "Statement by Apple on iPhone 4 reception issues">{{Cite press release
| title = Statement by Apple on iPhone 4 reception issues
| publisher = [[Apple Inc.]]
| date = 2 July 2010
| url = http://www.apple.com/pr/library/2010/07/02appleletter.html
| accessdate = 2 July 2010}}</ref> ''[[The New York Times]]'' commented that "the failure to detect this longstanding problem earlier is astonishing."<ref>{{cite news
| url = http://www.nytimes.com/2010/07/03/technology/03apple.html?src=un&feedurl=http%3A%2F%2Fjson8.nytimes.com%2Fpages%2Ftechnology%2Findex.jsonp
| title = Apple Acknowledges Flaw in iPhone Signal Meter
| last = Helft
| first = Miguel
| date = 2 July 2010
| publisher = The New York Times
| accessdate = 2 July 2010}}</ref>

''[[Consumer Reports]]'' initially stated that the iPhone 4's signal issues are not "unique, and may not be serious" and it continued to mention that signal loss is a problem that is faced by the entire smartphone industry. It has been such a problem that Apple made a formal apology. The next day, ''Consumer Reports'' altered their stance after encountering instances of dropped calls.<ref>{{cite web|url=http://blogs.consumerreports.org/electronics/2010/07/apple-iphone-4-antenna-problems-dropped-calls-att-signals-bars-os-software-bugs-glitches-os-os4-iphone4-reception-problems-in.html |title=Consumer Reports Electronics Blog: iPhone 4's supposed signal woes aren’t unique, and may not be serious |publisher=Blogs.consumerreports.org |date=2010-07-02 |accessdate=2010-11-11}}</ref> ''Consumer Reports'' rejected Apple's explanation after conducting tests in a controlled environment, and comparing the results against previous generations of iPhone. It sarcastically pointed out that using a piece of tape to cover the lower left antenna gap was one way to fix the problem, but recommended that consumers who "want an iPhone that works well without a masking-tape fix" purchase the [[iPhone 3GS]] instead.<ref name="consumerreports1">{{cite web
| url = http://blogs.consumerreports.org/electronics/2010/07/apple-iphone-4-antenna-issue-iphone4-problems-dropped-calls-lab-test-confirmed-problem-issues-signal-strength-att-network-gsm.html
| title = Lab tests: Why Consumer Reports can't recommend the iPhone 4
| date = 12 July 2010
| publisher = [[Consumer Reports]]
| accessdate = 12 July 2010}}</ref> ''Consumer Reports'' also tested the iPhone 4 whilst it was wearing a ''[[#Bumper|Bumper]]'', a frame-like cover manufactured by Apple that prevents direct contact with the antenna, reporting that it does fix the problem.<ref>{{cite web
| url = http://blogs.consumerreports.org/electronics/2010/07/apple-iphone4-iphone-4-bumper-case-fixes-antenna-issue-problem-signal-loss-tested-verified-consumer-reports-labs-quick-fix.html
| title = Apple’s Bumper case alleviates the iPhone 4 signal-loss problem
| date = 13 July 2010
| publisher = [[Consumer Reports]]
| accessdate = 13 July 2010}}</ref> ''[[CNN]]'' repeated ''Consumer Reports''' statement that a small amount of [[duct tape]] had proven an effective fix to the iPhone 4's dropped call issue.<ref>{{cite news
| url = http://www.cnn.com/2010/TECH/mobile/07/13/iphone.4.duct.tape/index.html?hpt=C1
| title = iPhone duct tape fix
| publisher = CNN
| date = 13 July 2010
| accessdate = 13 July 2010}}</ref>

On 16 July 2010, at a press conference, [[Steve Jobs]] announced that Apple would provide all iPhone 4 owners with a free case to help solve the antenna issue and a refund to those users who had already purchased a Bumper. The free case offer would be valid until 30 September 2010, when Apple would reevaluate the situation.<ref>{{Cite news |url=http://www.nytimes.com/2010/07/17/technology/17apple.html |title=Apple Offers Free Cases to Address iPhone Issue |newspaper=New York Times |date=July 16, 2010 |first=Miguel |last=Helft }}</ref><ref>{{cite web
| last = Rothman
| first = Wilson
| url = http://www.msnbc.msn.com/id/38263228/ns/technology_and_science-wireless
| title = Apple gives free bumpers to all iPhone 4 owners
| publisher = [[MSNBC]]
| date = 17 July 2010
| accessdate = 17 July 2010}}</ref> To get a free case, owners were able to apply via an app installed on the phone found in the App Store from 22 July 2010 to 30 September 2010. Jobs also announced that Apple could not produce enough Bumpers for all owners of the phone, but would source a supply and offer a range of cases.<ref name="Apple offers free iPhone 4 cases">{{cite news
| title = Apple offers free iPhone 4 cases
| url = http://www.bbc.co.uk/news/technology-10665424
| work = [[BBC News]]
| accessdate = 19 July 2010
| date = 16 July 2010}}</ref> Additionally, Jobs cited figures from [[AppleCare]] which showed that only 0.55 percent of all iPhone 4 users have complained to the company about the issue, while the number of phones returned to Apple was 1.7 percent{{ndash}}4.3 percentage points less than the number of iPhone 3GS models that were returned in the first month of the phone's launch.<ref name="Apple offers free iPhone 4 cases"/>

''Consumer Reports'' noted that the solution was not permanent, though a good first step.<ref>{{cite news
| last = D. Sutter
| first = John
| url = http://www.cnn.com/2010/TECH/mobile/07/16/consumer.reports.iphone.case/
| title = Bumper and all, Consumer Reports still doesn't recommend iPhone 4
| publisher = CNN
| date = 17 July 2010
| accessdate = 17 July 2010}}</ref> However, because Jobs did not specify a time line for fixing the problem, and the offering for a free bumper only being a temporary solution, ''[[PC World (magazine)|PC World]]'' decided to remove the iPhone 4 from its "Top 10 Cell Phones" chart and reassign it to a pending rating.<ref>{{cite web
| first = Ginny
| last = Mies
| url = http://www.pcworld.com/article/201320/iphone_4_why_weve_reconsidered_its_rating.html
| title = iPhone 4: Why We’ve Reconsidered Its Rating
| publisher = [[PC World (magazine)|PC World]]
| date = 17 July 2010
| accessdate = 17 July 2010}}</ref>

Despite the negative media attention regarding the antenna issues, 72% of iPhone 4 users say that they are "very satisfied" with their iPhone 4 according to a new survey by ChangeWave Research.<ref>{{cite web|url=http://www.pcworld.com/article/202625/survey_most_iphone_4_users_very_satisfied.html?tk=hp_blg |title=Survey: Most iPhone 4 Users 'Very Satisfied' |publisher=PCWorld |date=2010-08-05 |accessdate=2010-11-11}}</ref>

===Camera image fault===
Reports about iPhone 4 cameras being rendered useless by a peculiar fault started to show up on the Internet in September 2010. Under certain lighting conditions the back camera produces a large green 'halo' in the center of the image.<ref>{{cite news| url=http://images.smh.com.au/2010/08/23/1839729/blueishphoto2-600x400.jpg | work=The Sydney Morning Herald}}</ref> This renders many of these images to be of much lower quality than what the iPhone 3GS is capable of producing under similar lighting conditions. Reports started surfacing on forums and have since been picked up by major media sources.<ref>{{cite news| url=http://www.smh.com.au/digital-life/iphone/iphone-4-camera-rendered-useless-by-mysterious-fault-20100823-13ehb.html | work=The Sydney Morning Herald | first=Ben | last=Grubb | title=iPhone 4 camera rendered 'useless' by mysterious fault | date=August 23, 2010}}</ref>

== Critical reception == <!--"Critical" is necessary to prevent confusion with cellular reception.-->

===Reaction to the announcement===
Media reaction to [[Steve Jobs|Steve Jobs']] announcement of the iPhone 4 was generally positive.<ref>{{cite news
| url = http://bits.blogs.nytimes.com/2010/06/23/iphone-4-reviews-the-pundits-weigh-in/
| title = iPhone 4 Reviews: The Pundits Weigh In
| first = Nick
| last = Bilton
| publisher = The New York Times
| date = {{Start date|2010|06|23}}
| accessdate = {{Start date|2010|06|25}}}}</ref> The announcement included information that had not been covered by Gizmodo. [[Fox News Channel|Fox News]] commented that "seeing it in action is far more informative than staring at Gizmodo's photos of a busted test unit".<ref>{{cite news
| url = http://www.foxnews.com/scitech/2010/06/08/apple-iphone-questions-answered/
| title = Your iPhone 4 Questions Answered
| first = Harry
| last = McCracken
| publisher = [[Fox News Channel|Fox News]]
| date = {{Start date|2010|06|08}}
| accessdate = {{Start date|2010|07|13}}}}</ref> [[Rhodri Marsden]] of [[The Independent]] said that "aside from the introduction of face-to-face video calling, it's not a staggering feature set," instead focusing on how the device is "more powerful than its predecessor, speedier, easier to use and will make previously laborious tasks seem like a cinch".<ref>{{cite news
| url = http://www.independent.co.uk/life-style/gadgets-and-tech/features/rhodri-marsden-you-might-not-like-it-but--jobs-has-set-the-pace-1994092.html
| title = You might not like it, but Jobs has set the pace
| first = Rhodri
| last = Marsden
| authorlink = Rhodri Marsden
| publisher = [[The Independent]]
| date = {{Start date|2010|06|08}}
| accessdate = {{Start date|2010|07|13}}
| location=London}}</ref>

[[CNET.com|CNET]] reacted to the announcement by explaining how it believes that [[iMovie#iMovie for iOS|iMovie for iOS]] was the "most exciting part of this year's WWDC Keynote". The article noted how the iPhone 4, unlike current cameras, can record HD content and then edit it from the same device, labeling it a "true mobile editing suite".<ref>{{cite web
| url = http://reviews.cnet.com/8301-19512_7-20007040-233.html
| title = iMovie for iPhone 4 and the future of filmmaking
| first = Joe
| last = Aimonetti
| publisher = [[CNET.com|CNET]]
| date = {{Start date|2010|06|08}}
| accessdate = {{Start date|2010|07|13}}}}</ref>

===Reviews===
Reviews of the iPhone 4 have been generally favorable. [[Walt Mossberg]] of ''[[The Wall Street Journal]]'' called the device "the best device in its class".<ref>{{cite news
| url = http://online.wsj.com/article/SB10001424052748704853404575322951290405346.html
| title = New iPhone Keeps Apple Top of Class
| first = Walter
| last = Mossberg
| authorlink = Walter Mossberg
| publisher = The Wall Street Journal
| date = {{Start date|2010|06|20}}
| accessdate = {{Start date|2010|06|25}}}}</ref> [[Engadget]] named it the "best smartphone on the market right now".<ref name = "Engadget iPhone 4 review">{{cite web
| url = http://www.engadget.com/2010/06/22/iphone-4-review/
| title = iPhone 4 review
| first = Joshua
| last = Topolsky
| authorlink = Joshua Ryan
| publisher = [[Engadget]]
| date = {{Start date|2010|06|22}}
| accessdate = {{Start date|2010|07|13}}}}</ref> [[CNET]] gave the iPhone 4 a rating of 8.6 out of 10, one of the highest ratings it has given any smartphone.<ref>{{cite web
| url = http://reviews.cnet.com/smartphones/apple-iphone-4-32gb/4505-6452_7-34117595.html
| title = Apple iPhone 4 – 32GB — black (AT&T) Smartphone reviews
| publisher = [[CNET Networks|CNET.com]]
| date = {{Start date|2010|06|23}}
| accessdate = {{Start date|2010|06|25}}}}</ref> [[TechRadar]] gave the device 4.5/5 stars.<ref>{{cite web
| url = http://www.techradar.com/reviews/phones/mobile-phones/apple-iphone-4-694980/review?artc_pg=15
| title = Apple iPhone 4 review
| publisher = [[TechRadar]]
| date = {{Start date|2010|06|25}}
| accessdate = {{Start date|2010|06|25}}}}</ref> Consumer Reports said the signal problem was the reason they didn't rate it a "recommended" model, although the other tests ranked it highest among smart phones.<ref name="consumerreports1"/>

[[Joshua Ryan|Joshua Topolsky]] of [[Engadget]] described the device's industrial design as being "more detailed and sophisticated" than its predecessor.<ref name = "Engadget iPhone 4 review"/>

==Timeline of iPhone models==
{{Timeline of iPhone models}}

==Notes==
{{Refbegin}}
* {{Note label|A|a|none}}The initial release date of 24 June 2010 applies only to the United States, the United Kingdom, France, Germany, and Japan.<ref>{{Cite press release
| title = We will ship in 5 countries
| publisher = [[Apple Inc.]]
| date = {{Start date|2010|06|07}}
| url = http://www.blogcdn.com/www.engadget.com/media/2010/06/Apple-wwdc-2010-399-rm-eng.jpg
| accessdate = {{Start date|2010|06|21}}}}</ref>
* {{Note label|B|b|none}}SIM-free iPhone 4s are only available directly from Apple in Canada, France, Germany<ref>{{cite web|url=http://store.apple.com/de/browse/home/shop_iphone/family/iphone?mco=OTY2ODA2OQ |title=iPhone 4 & iPhone 3GS - Apple Store (Deutschland) |publisher=Store.apple.com |date= |accessdate=2010-11-11}}</ref> and the United Kingdom as of the device's initial release.<ref>{{cite web
| url = http://www.9to5mac.com/17955/Apple-confirms-SIM-free-iPhones-are-truly-unlocked
| title = Apple confirms SIM-free iPhones are truly unlocked
| first = Jonny
| last = Evans
| date = {{Start date|2010|06|15}}
| publisher = [[9 to 5 Mac]]
| accessdate = {{Start date|2010|06|20}}}}</ref>
* {{Note label|C|c|none}}The Advanced Performance Optimization on iOS, part 2 session.
* {{Note label|D|d|none}}6 percent of iPhone 3GS models were returned within the first month of the phone being on sale.<ref name="Apple offers free iPhone 4 cases"/>
{{Refend}}

==References==
{{Reflist|colwidth=30em}}

==External links==
{{Commons category|iPhone 4}}
{{Wikinewspar2|Apple unveils iPhone 4, iOS 4 at Worldwide Developers Conference 2010|Apple swamped by iPhone 4 pre-orders|Apple to give free cases, refunds to iPhone 4 owners}}
{{Portal box|Apple Inc.}}
* [http://www.apple.com/iphone/ iPhone official website]
* [http://gadgetstress.com/2010/09/stress-test-of-apple-iphone-4-16-gb/ Stress test of Apple iPhone 4 (16 Gb)]
* [http://nowmobile.blogspot.com/p/iphone-bugs.html Pros & Cons]

{{iPhone}}
{{iOS}}
{{Apple hardware since 1998}}
{{Apple}}

{{DEFAULTSORT:Iphone 4}}
[[Category:IPhone]]
[[Category:2010 introductions]]
[[Category:Camera phones]]
[[Category:Videotelephony]]
[[Category:Touchscreen mobile phones]]

[[ar:آي فون 4]]
[[et:IPhone 4]]
[[es:IPhone#iPhone_4]]
[[fa:آی‌فون ۴]]
[[ko:아이폰 4]]
[[hi:आइफोन ४]]
[[hr:IPhone 4]]
[[id:IPhone 4]]
[[it:IPhone 4]]
[[no:IPhone 4]]
[[pt:IPhone 4]]
[[fi:IPhone 4]]
[[sv:Iphone 4]]
[[th:ไอโฟน 4]]
[[tr:İPhone 4]]

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