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IPhone 4 in Black Developer (UMTS/GSM model) (CDMA model) 'This changes everything. The iPhone 4 is a that was designed and marketed by It is the generation, succeeding the and preceding the. Following a number of notable leaks, the iPhone 4 was first unveiled on June 7, 2010, at Apple's in, and was released on June 24, 2010, in the United States, United Kingdom, France, Germany and Japan. The iPhone 4 introduced a new hardware design to the iPhone family, which Apple's touted as the thinnest smartphone in the world at the time; it consisted of a stainless steel frame which doubles as an antenna, with internal components situated between glass.

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The iPhone 4 also introduced Apple's new high-resolution ' with a of 326 pixels per inch while maintaining the same physical size and aspect ratio as its precursors. The iPhone 4 also introduced Apple's, along with —which notably introduced multitasking functionality and Apple's new service.

The iPhone 4 was also the first iPhone to include a, and the first to be released in a version for networks, ending 's period as the exclusive carrier of iPhone products in the United States. The iPhone 4 received generally positive reception, with critics praising its revamped design and more powerful hardware in comparison to previous models.

While it was a market success, with over 600,000 pre-orders within 24 hours, the release of the iPhone 4 was plagued by highly publicized reports that abnormalities in its new antenna design caused the device to lose its cellular signal if held in a certain way. Most human contact with the phone's outer edge would cause a significant decrease in signal strength. The iPhone 4 spent the longest time as Apple's flagship iPhone model at fifteen months, and had the longest lifespan of any ever produced, spanning close to four years and available in some until early 2015. Although the succeeding 4S was announced in October 2011, the 4 continued to be sold as a midrange model until September 2012, and thereafter as the entry-level offering in Apple's lineup until September 2013 with the announcement of the /.

Further information: Prototypes Before the official unveiling of the iPhone 4 on June 7, 2010, two were brought to the attention of the media, breaching Apple's normally secretive development process. Many of the speculations regarding technical specifications proved accurate. Engadget leak On January 27, 2010, gadget website received leaked images of the unreleased.

Unbeknownst to the editors and readers these images contained two of the unreleased iPhone 4's. It wasn't until the subsequent release were they aware of the complete contents of the images. Gizmodo leak On April 19, 2010, gadget website reported that they had purchased an iPhone prototype for $5000, and furthermore, had conducted a of the device. The prototype is reported to have been lost by an Apple employee, Gray Powell, in. 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.

On April 23, officers from the Rapid Enforcement Allied Computer Team (REACT) task force of the California raided the home of Jason Chen, the Gizmodo editor responsible for reviewing the prototype, seizing all of his computers and hard drives. The 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 before the raid when it was returned by Gizmodo. The 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.

Taoviet leak Pictures and video of a second prototype were published on a Vietnamese website, Taoviet, on May 12, 2010. It was almost identical to the first, and used an A4 chip manufactured by Apple. The website purchased the prototype for $4,000. 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 available for pre-order on June 15, 2010.

Customers attempting to pre-order the iPhone 4 reported problems with the pre-order process on the US and UK online which due to the surge in traffic. The same issue was reported with and, 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.

Retail stores were also unable to complete pre-order transactions due to the servers crashing. 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 had received in a single day for any device up to that point. Reported that at 20:30, all iPhone 4 pre-order suppliers had sold out. 1.7 million iPhone 4s were sold in its first three days of availability.

The iPhone 4 has also been released through in Tunisia and was available in eight cities at the launch. On July 30, 2010, iPhone 4 was made available for sale in Australia, New Zealand and 15 other countries with free bumper cases. In South Korea, it was released by on September 10.

In Israel, it was released, too, on September 24, through,. 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. The iPhone 4 was released in South Africa on September 22 on the and networks, in very limited quantities. The iPhone 4 was launched in Vietnam on September 30 on VinaPhone and Viettel, at first in 3 major cities:, and, and then all over the country by the end of October. The iPhone 4 was launched in India on May 27, 2011.

On January 11, 2011, announced during a media event that it had reached an agreement with Apple and would begin selling a iPhone 4 in the United States, ending Apple's exclusivity agreement with AT&T. The Verizon iPhone went on sale on February 10 and pre orders began on February 3. The Verizon iPhone includes the 'Personal Hotspot' feature which allows a user to use the iPhone as a wireless, with up to five devices connecting at one time. The February 3, 2011, presale of the iPhone 4 broke Verizon's first day sales records for a single device.

On June 24, 2010, Apple issued a statement that the white iPhone 4 models were proving more 'challenging to manufacture' than expected, and initially pushed the release date back to the second half of July. There was a lot of speculation surrounding the delay 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. On April 27, 2011, Apple announced that it would be releasing the white iPhone 4 model on April 28, 2011, for both GSM and CDMA. The release of the white iPhone 4 was carried out on April 28.

During Apple's official unveiling of the on October 4, 2011, it was announced that would begin carrying the reconfigured CDMA iPhone 4 and the iPhone 4S in the US on October 14. Discontinuation In September 2013, after the release of the and, Apple stopped selling the iPhone 4 in most of their stores as well as on their website. It was replaced by the 8 GB iPhone 4S.

See also: The display of the iPhone 4 is manufactured by under an exclusive contract with Apple. It features an with a pixel density of 326 (ppi) on a 3.5 in (8.9 cm) (diagonally measured), 960×640 display. Each pixel is 78 in width.

The display has a 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 305 millimetres (12 in) from one's eye, or 57 per pixel is the maximum amount of detail that the human can perceive. With the iPhone expected to be used at a distance of about 12 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.

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Raymond Soneira, president of DisplayMate Technologies, said in an interview with, 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 12 inches (305 mm) from the eyes, or 36 arcseconds per pixel. However, author of, whose career includes a collaboration with regarding the camera on the, 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'. The iPhone 4 is the first iPhone 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 camera, and a backside-illuminated 5 rear-facing camera with a 3.85 mm f/2.8 lens and an flash. The rear-facing camera is capable of recording in at 30.

Both cameras make use of the tap to focus feature, part of iOS 4, for photo and video recording. The rear-facing camera has a 5×. Connectivity In contrast to Steve Jobs' announcement at WWDC 2010, recent documentation has shown that the iPhone 4 contains a antenna, not a quad-band 3G UMTS radio, as advertised by Apple. According to the documentation filed by Apple, the radio inside the iPhone 4 supports 800, 850, 900, 1,900, and 2,100 MHz.

The 800 MHz frequency, which is most commonly used in Japanese mobile phones, is not advertised as being supported by Apple. However, the 800 MHz band is a subset of the 850 MHz band, which probably explains why the device is advertised as quad-band. The chip-sets were manufactured by and for GSM version. As with most of Apple's mobile products at the time, the iPhone 4 also used the as its only external data port. The iPhone 4 is the first generation of iPhone to have a second used for.

It is located on the top of the unit near the headphone jack; the main microphone is on the bottom left. Gyroscope and accelerometer The iPhone 4 introduces a that detects 3-axis angular acceleration around the, enabling precise calculation of. The gyroscope complements the, a sensor that has been present since the, 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. Processor and memory The iPhone 4 is powered by the chip, which was designed by and, like all prior iPhone models, manufactured. This is composed of an integrated with a. The Apple A4 is also used in the where it is clocked at its rated speed of 1.

The clock speed in the iPhone 4 has not been disclosed. All prior of the iPhone have the CPU, which typically extends battery life and lowers. The iPhone 4 has 512 MB of. The additional DRAM supports increased performance and multi-tasking. Storage and micro-SIM. An iPhone 4 A1332 with a micro-SIM card removed with a paper clip, showing its compartment sim card The iPhone 4 uses a on iPhone 4 devices running on a GSM network, which is positioned in an ejectable tray, located on the right side of the device.

On a CDMA network, however, the phone connects to the network using an. All prior models have used regular 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 prior models, all data is stored in, 8, 16 or 32 GB, and not on the SIM. Unlike prior generations, the storage capacity is not printed on the back of the unit.

The iPhone 4 is constructed of glass faces and a metal rim. The iPhone 4 features a redesigned structure, designed by, a design that would later be reused and adapted for the,. 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 and uniformity of existing Apple products, such as the and the. The overall dimensions of the iPhone 4 have been reduced from its predecessor. It is 115 millimetres (4.5 in) high, 58.6 millimetres (2.31 in) wide, and 9.4 millimetres (0.37 in) deep, compared to the iPhone 3GS, which is 116 millimetres (4.6 in) high, 62 millimetres (2.4 in) wide, and 12 millimetres (0.47 in) deep; making the iPhone 4 24% thinner than its predecessor, the.

Claimed it to be 'the thinnest smartphone on the planet.' The reduced size of the device is primarily due to the externally placed antenna. The iPhone 4 is structured around a frame that wraps around the edge of the phone, acting both as the primary structure for the device and as the iPhone 4's antennas. This metal band features two slits on the version of the phone, 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, and antenna, and the right and lower sections of the band act as the antenna for GSM and connectivity.

On the CDMA version of the phone there are four slits in the metal band. Two at the top (on the left and right) and two at the bottom.

This divides the metal band into four different segments, which like the GSM version of the phone, serves as different antennas for connectivity. The top portion of the band (divided by the top left and right slits) is for connecting to the network. The left portion of the metal band is for Bluetooth, Wi-Fi, and GPS just like the GSM version. The right side is not an antenna, but serves to cosmetically mirror the left side and also to create a similar look to the GSM version of the phone. The internal components are situated between two panels of 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 prior models. In fall 2010, started to replace the Philips screws used in post-repair units in the US and in production units in Japan. Software.

Further information: The iPhone 4 shipped with, which was the newest version of Apple's at the time. IOS 4 introduced a multitasking system, allowing apps to remain 'suspended' in memory, perform certain operations in the background, and allowing users to switch between apps using an on-screen menu. It also introduced, which allows users to perform video calls between other iPhone, and users. The iPhone 4 supports up to, released in September 2013. Due to the relatively aged hardware of the iPhone 4, certain features available on newer iPhone models are not available on the device; as of iOS 7, they include, 3D and turn-by-turn navigation, mirroring, live camera filters, panorama mode and certain visual effects introduced by iOS 7, such as the blurring of translucent interface elements, the effect on the home screen, and live wallpapers. While still subject to the same limitations, iOS 7.1 did bring some slight performance improvements to the operating system on the iPhone 4. IOS 7, specifically iOS 7.1.2, is the last version of iOS to support the iPhone 4.

Unlike the iPhone 4S, the iPhone 4 did not receive the iOS 8 update due to performance issues. Accessories Bumper. 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, with the purpose of protecting the phone. 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.

Additionally, the plastic band 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, headphone jack, speaker, and microphones. Apple updated the bumper with a wider volume switch hole with the release of iPhone 4 for CDMA network. The updated bumper is also compatible with, the next generation iPhone that has the identical exterior design and measurements as iPhone 4 CDMA. Reception Pre-release Pre-release reception was generally positive.

The announcement included information that had not been covered by Gizmodo. Commented that 'seeing it in action is far more informative than staring at Gizmodo's photos of a busted test unit'. Of 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'. Reacted to the announcement by explaining how it believes that 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'. Reviews Reviews of the iPhone 4 have been generally favorable.

Of called the device 'the best device in its class'. Named it the 'best smartphone on the market' in June 2010. Gave the iPhone 4 a rating of 8.6 out of 10, one of the highest ratings it has given any smartphone.

Gave the device 4.5/5 stars. Consumer Reports said the signal problem was the reason they did not rate it a 'recommended' model, although the other tests ranked it highest among smart phones. Of described the device's industrial design as being 'more detailed and sophisticated' than its predecessor. Technical problems Some users reported a yellow discoloration of the screen that disappeared after several days, which was attributed to the glass glue that was used.

It did not have time to dry fully before the unit reached consumers due to the speed of manufacturing. 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. Some users reported that, particularly in low-light conditions, photos taken on the iPhone 4 sometimes contained blue or green 'splotches.' Issues with were also discovered, particularly when using the flash. 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. 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. As a consequence of this problem, it was reported on July 2, 2010 that several iPhone 4 users were planning on suing and for fraud by concealment, negligence, intentional misrepresentation and defective design.

The legal challenge was started by a law firm, who set up a website to recruit disenchanted iPhone 4 buyers for a lawsuit against Apple. Later that day, Apple issued another statement stating that it had discovered the cause of the 'dramatic drop in bars'. 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. Commented that 'the failure to detect this longstanding problem earlier is astonishing.'

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, the magazine altered their stance after encountering instances of dropped calls. The magazine rejected Apple's explanation after conducting tests in a controlled environment, and comparing the results against prior 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 instead. The magazine also tested the iPhone 4 while it was wearing a, a frame-like cover sold by Apple that prevents direct contact with the antenna, reporting that it did resolve the problem. Repeated Consumer Reports' statement that a small amount of had proven an effective fix to the iPhone 4's dropped call issue.

On July 16, 2010, at a press conference, 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 September 30, 2010, when Apple would re-evaluate the situation. To get a free case, owners were able to apply via an app installed on the phone found in the App Store from July 22, 2010 to September 30, 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.

Additionally, Jobs cited figures from 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 – 4.3 percentage points less than the number of iPhone 3GS models that were returned in the first month of the phone's launch. Consumer Reports noted that the solution was not permanent, though a good first step. 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, decided to remove the iPhone 4 from its 'Top 10 Cell Phones' chart and reassign it to a pending rating. 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 an August 2010 survey by ChangeWave Research.

The iPhone 4 model continued to be sold unchanged up until September 2013. IPhones in space In 2011, two iPhone 4 units equipped with a special application were taken to the aboard the on the mission. The devices were used in various experiments, utilizing sensors and a special app. Timeline of iPhone models.

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