I'd argue that phones are becoming a lot less like computers and more like cars. At least the iPhone as an example, phones are becoming more and more an information appliance, taken for granted to "just work."

They might be able to do a lot of the things that a "real" computer does but you don't have the power to treat them like regular computers. You can't easily put a new OS on them, write software for them without going through a central market place, etc. Apple obviously has this vision, but it's becoming clear that Microsoft shares it, at least for Windows Phone 7.

Right. People own a variety of computers. Different models of Dell, HP, sony, apple., etc.