Once upon a time, phones were for making phone calls. And they weren't always very good at that. Now, of course, that's just a minor piece of functionality. They're for texting, holding your calendar and address book, playing games, listening to music, surfing the Net, getting travel directions, twittering, and, of course, watching movies while you're supposed to be doing something else.
Here's Jeff's Nokia N-78 playing - oh, you all recognise this movie by now, don't you?