iPhone 4
The iPhone 4 is a touchscreen smartphone developed by Apple. It is the fourth generation of iPhone, and successor to the iPhone 3GS. It is particularly marketed for 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 2010 held at the Moscone Center, San Francisco,[7] 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 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 uninsulated stainless steelframe that acts as the device's antenna. The internal components of the device are situated between two panels of chemically strengthenedaluminosilicate glass.[8] It has an Apple A4 processor and 512 MB of eDRAM, twice that of its predecessor and four times that of the original iPhone. Its 3.5-inch (89 mm) LED backlit liquid crystal display with a 960×640 pixel resolution is marketed as the "Retina Display".
The latest operating system release, iOS 4.2.1, added functionality such as AirPrint, and AirPlay
 | |
|---|---|
 An iPhone 4 displaying SpringBoard | |
| Developer | Apple Inc. |
| Manufacturer | Foxconn (GSM model) Pegatron (CDMA model) (OEM)[1] |
| Slogan | This changes everything. Again.[2] |
| Form factor | Touchscreen smartphone |
| Generation | 4 |
| Release date | GSM model: 24 June 2010[a] CDMA model: 10 February 2011[a] |
| Units sold | 30.3+ million[3] |
| Operating system | iOS 4.2.1 (build 8C148) Released November 22, 2010; 2 months ago |
| Power | Built-in rechargeable Li-ion battery 3.7 V at 1420 mAh[4] |
| CPU | Apple A4 (ARM Cortex-A8)[5] |
| GPU | Apple A4 (PowerVR SGX 535)[5] |
| Storage capacity | 16 GB or 32 GB flash memory |
| Memory | 512 MB eDRAM[6] |
| Display | 3.5-inch (89 mm) diagonal 1.5:1 aspect ratio widescreen LED backlit IPS TFT LCD Retina display 640x960 resolution at 326 ppi (0.61 Megapixels) 800:1 contrast ratio (typical) 500 cd/m2 max brightness (typical) Fingerprint-resistant oleophobic coatingon front and back glass |
| Audio | Single loudspeaker 3.5 mm TRRS Frequency response: 20 Hz to 20 kHz |
| Input | Multi-touch touchscreen display Push-buttons Dual microphone 3-axis gyroscope 3-axis accelerometer Digital compass Proximity sensor Ambient light sensor |
| Rear camera | 5 MP back-side illuminated sensor HD video (720p) at 30 fps 1.75 μm size pixels 5× digital zoom Tap to focus video or still images LED flash Photo and video geotagging |
| Front camera | .3 MP (VGA) SD video (480p) at 30 fps 25.17 μm size pixels Tap to focus video or still images Photo and video geotagging |
| Connectivity | Wi-Fi (802.11 b/g/n) (2.4 GHz only) Bluetooth 2.1 + EDR GSM model: Quad-bandGSM/GPRS/EDGE (800 850 900 1800 1900 MHz) Quad-band UMTS/HSDPA/HSUPA (800 850 900 1900 2100 MHz) (800 MHz not yet announced as supported by Apple) CDMA model: Dual-band CDMA/EV-DO Rev. A (800 1900 MHz) |
| Online services | App Store, iTunes Store, iBookstore,MobileMe |
| Dimensions | 115.2 mm (4.54 in) (h) 58.66 mm (2.309 in) (w) 9.3 mm (0.37 in) (d) |
| Weight | 137 g (4.8 oz) |
| Predecessor | iPhone 3GS |
| Related articles | iPad, iPod Touch (comparison) |