The battery in the iPhone 4 offers up to 14 hours of talk time.
The iPhone 4 -- sometimes referred to as the iPhone 4G -- is a combination multimedia device and smartphone developed by Apple. It runs on Apple's proprietary iOS operating system and is available in 16 gigabyte (GB) and 32GB configurations. The phone works on AT&T and Verizon networks in the United States.
History and Controversy
According to technology website Gizmodo, in April 2010 an Apple employee mistakenly left an early prototype of the iPhone 4 in a California bar. Gizmodo purchased the prototype for $5,000. The company then published photos and technical specifications of the device online, prompting lawyers for Apple to issue a much-publicized letter asking that Gizmodo return the prototype. Gizmodo complied. Apple officially released the iPhone 4 on June 24, 2010. It sold more than 1.7 million units in its first three days on the market.
Physical Specifications
The iPhone 4 measures 2.3 inches wide, 4.5 inches tall and just under 0.4 inches thick. It weighs 4.8 oz., or 0.3 pounds. It uses an ARM Cortex-A8 processor built on ARMv7 architecture with a clock speed of 1.0 gigahertz (GHz). On-board power for the iPhone 4 comes from a built-in rechargeable 1420 mAh lithium-ion battery. The phone comes with a set of Apple headphones, a USB power adapter and a dock connector.
Display and Multimedia
Apple outfits the iPhone 4 with a 3.5-inch wide-screen multi-touch display. The display features a native resolution of 960 by 640 pixels and contrast ratio of 800 to 1. The screen features retina display and a typical contrast ratio of 800 to 1. It supports H.264, MPEG-4 and Motion JPEG video formats at varying resolutions. The device also features two integrated cameras, one outward-facing with a 5-megapixel sensor and 5x zoom, and one inward-facing with a 0.3-megapixel sensor.
Connectivity
The iPhone 4 is built around a stainless steel frame. The frame also serves as the phone's antenna. GSM versions of the iPhone 4 are compatible with HSUPA, UMTS and HSDPA networks at 850, 900, 1900 and 2100 megahertz (MHz), as well as with GSM/ EDGE networks at frequencies of 850, 900, 1800 and 1900 MHz. CDMA versions of the iPhone 4 support CDMA EV-DO Rev A networks at frequencies of 800 and 1900 MHz. The iPhone 4 also offers both 802.11b/g/n capability and Bluetooth 2.1 functionality.
Additional Features
Additional features of the iPhone 4 include assisted global positioning service (GPS) capability, a digital compass, three-axis gyro support, a proximity sensor, ambient light sensor and an accelerometer. The iPhone 4 has a 3.5-mm audio output jack for connecting the device to headphones or an external stereo system. The phone connects to a computer via a 30-pin dock connector.
Tags: contrast ratio, dock connector, networks frequencies, versions iPhone
