Steve Jobs being quoted as saying "iPhone runs OS X"; however it was later referred to as iPhone Software. During the development phase of iPhone OS 1, there were around 16 or 17 concepts that were developed. Many on the team were skeptical of the feasibility of a touchscreen keyboard, and believed that users would prefer hardware keyboards. A number of different user interfaces were prototyped, including one that involved a multi-touch click-wheel.

iPhone OS 1 laid the