Modular cell phone software.

The phone provider would show you a list of software packages available for your phone. You scroll through the list and pick the ones you want. Then, you get to choose which buttons do what with which program, which programs appear on the phone, and how they appear on the phone's display. Don't like the snapshot button on the side of the phone? No problem. Simply have the pound key entrained to perform that function. Want your organizer to display the minute timer at the top of the list so you don't have to scroll down to get to it? No problem. You could basically reconfigure every aspect of the phone to your liking and even get rid of extraneous programs that you don't use to cut down on the clutter.