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iPhone OS 1.1.4 is the final version of iPhone OS 1 for the first generation iPhone, with iPhone OS 1.1.5 being the final version of iPhone OS 1 available for the first generation iPod Touch. IPhone OS 1.1 was the first version supported by the first generation iPod Touch. It also lacked support for third-party native apps, and only supported web apps, which was criticized by reviewers and developers, including John Carmack.

IPhone OS 1 was criticized for its lack of support for Adobe Flash web content, copy and paste, and Bluetooth stereo headphones. A number of different user interfaces were prototyped, including one that involved a multi-touch click-wheel. Many on the team were skeptical of the feasibility of a touchscreen keyboard, and believed that users would prefer hardware keyboards. During the development phase of iPhone OS 1, 'probably 16, 17 different concepts' were developed. No official name was given when the iPhone was released, and Steve Jobs just said 'iPhone runs OS X'. Apple announced iPhone OS 1 at the iPhone keynote on January 9, 2007, and it was released to the public alongside the first-generation iPhone on June 29, 2007.

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