Before the touchscreen iPhone was revealed at MacWorld in 2007, Apple had a team of engineers working on a click-wheel phone that was kind of like a mashup of an iPod and a phone. It was never released, but the work that went into it is pretty fascinating.
In an interview with TechCrunch, former Apple engineer and Nest co-founder Matt Rogers talks about what it was like to work on the click-wheel iPhone when no one else at the company even knew Apple was developing a phone.