"Except for the full touchscreen handsets, most mobile phones have two distinct areas - data input UI and display. All the electronics making the phone work go into a phone casing underneath.
In most cases, these two areas are in some way connected to form a handset, and can not be used separately.
But, when you really think about it, there’s no real necessity to have the phone display and keypad in one piece. And there actually may be some cases, where having detached data input and display areas would make more sense. Samsung’s phone/watch configuration would be one of such case.
Now, Sony Ericsson decided to take the idea a step further, and applied it to a normal clamshell phone"
