Apple has released eleven generations of i Phone models, each accompanied by one of the eleven major releases of the i OS operating system.
The original first-generation i Phone was a GSM phone and established design precedents, such as a button placement that has persisted throughout all releases and a screen size maintained for the next four iterations.
Other functionality, such as video games, reference works, and social networking, can be enabled by downloading mobile apps.As of January 2017, Apple's App Store contained more than 2.2 million applications available for the i Phone.Apple rejected the "design by committee" approach that had yielded the Motorola ROKR E1, a largely unsuccessful collaboration with Motorola.Among other deficiencies, the ROKR E1's firmware limited storage to only 100 i Tunes songs to avoid competing with Apple's i Pod nano.The device is 18% thinner than the i Phone 4S, measuring 7.6 millimetres (0.3 in), and is 20% lighter at 112 grams (4 oz).
On July 6, 2013, it was reported that Apple was in talks with Korean mobile carrier SK Telecom to release the next generation i Phone with LTE Advanced technology.
In 2013, Apple released the 5S with improved hardware and a fingerprint reader, and the lower-cost 5C, a version of the 5 with colored plastic casings instead of metal.
They were followed by the larger i Phone 6, with models featuring 4.7-and-5.5-inch (120 and 140 mm) displays.
Users of the i Phone 4 reported dropped/disconnected telephone calls when holding their phones in a certain way. On January 11, 2011, Verizon announced during a media event that it had reached an agreement with Apple and would begin selling a CDMA i Phone 4.
Verizon said it would be available for pre-order on February 3, with a release set for February 10.
On September 12, 2012, Apple announced the i Phone 5.