Former Apple team leader sheds light on the story behind the original iPhone clickwheel prototypes
The thing that perhaps received the most attention was a YouTube video uploaded by Sonny Dickson, which appeared to show two prototypes of the original iPhone - the P1 and P2. The video would have you believe the tale that there were two teams within Apple that competed for Steve Jobs' approval – one crew tried to create a version of OS X that would work on a mobile device, and the other made efforts to turn the famous iPod into a phone.
However, this story was debunked by Tony Fadell in an interview with The Verge. Mr. Fadell, who is known as “one of the fathers of the iPod”, was a team leader in Apple's iPhone division at the time. He explained that his team was developing a lot of different UI's, with around 16-17 potential software and hardware approaches for their smartphone project. He further elaborated by stating that there was a competing set of ideas, and the entire division worked together on finding the best solution:
Fadell continued with an explanation on what exactly we're seeing in the video. He revealed that Apple used two different kinds of prototypes – development board prototypes and prototypes for the UI team. The different “operating systems” that the video shows are actually nothing more than apps, created via Adobe Director by the UI team, which were later ported by someone to a hardware prototype. Fadell stated that he wasn't aware when did the porting occur or who did it:
As for the origins of iOS, Fadell revealed that there were initially a Linux-based OS that was developed by the former leader of the iPhone division Jon Rubinstein, and another project headed by Scott Forstall, that aimed to reduce OS X for a mobile device. When Tony Fadell took over, he killed the Linux project and went ahead with Purple OS – the codename of what we now know as iOS.
In terms of hardware, the ARM processor that was used in the first iPhones was chosen due to it being present on the iPod:
source: The Verge