I have a flip-phone.
I've had it for a number of years now, and the cell phone provider keeps bugging me to upgrade.
Here's the kicker: depending on the model I get, I may have to increase the data charges to accomodate the new phone. This also depends on whether or not I get a smartphone. I wouldn't mind having a Droid (on my definite wishlist) but I'll have to research it a bit more.
Don't blindly upgrade your cell phone just because you can get the latest and greatest gizmo. Chances are the cell phone provider is going to stick you with another two-year committment. Personally, I'm happy with my provider, for the most part.
But I still have to read the fine print.