I don't have the answer to that, but I know that the device has a multi-touch screen and the interface for the user is built around that
Steve Jobs was the one who invented it - and interestingly, the iPhone has a virtual keyboard!
I just got my first iPhone. Do you know anything about the iPhone history? I do!  It was June 29, 2007 when the first iPhone was released! That is when the first one came out? I didnt think it would be that long ago. Who invented it?
The user interface is built around the device's multi-touch screen, including a virtual keyboard.