Why don't mobile phones, or cell phones, or whatever you call them, have satnav on them? You know - the satellite global positioning navigation thingy that means you know where you are and how to get where you're going. I think it would be a really valuable feature. Much more useful than picture messaging, or downloading music, or games.
I'm sure the networks would find a way to charge you money for it, so why don't they do it?