Steve Jobs once referred to the iPod touch as "training wheels for the iPhone".

10 September 2007: One millionth iPhone is sold

It took Apple 74 days to sell a million units of the first iPhone: a great and by no means universally predicted success, but one that would be continually outshone by later iOS devices.

9 June 2008: Apple unveils the iPhone 3G

In 2008 Steve Jobs established the tradition of announcing an update to the iPhone at WWDC, also held in San Francisco. As the name suggested, the new model differed most significantly from the first-gen iPhone in offering a 3G data connection for faster downloads. But it also saw external modifications, with a tapered-edge, grip-friendly chassis, a plastic back and black and white colour options.