The iPhone 4 is a slate smartphone developed by Apple. It is the fourth generation of iPhone, and is the successor to the iPhone 3GS. The iPhone 4 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. The iPhone 4 was announced on June 7, 2010, at the Moscone Center in San Francisco,. It was released for sale 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 that is used on previous iPhone versions, the Apple iPad, and the Apple 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 steel frame that acts as the iPhone's antenna. It has an Apple A4 processor and 512 MB of eDRAM, twice that of its predecessor and four times that of the original iPhone. The iPhone 4 has a 3.5-inch (89 mm) LED backlit liquid crystal display with a 960×640 pixel resolution, it is marketed as the "Retina Display". The latest operating system release, iOS 4.1, added new functionality such as high dynamic range photos and entertainment in the Game Center.
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