I'm thinking of upgrading my crappy flip phone to a different phone that's a lot better. I'm thinking of getting an unlocked iPhone 3GS (or iPhone 4; not sure though) from eBay or from a friend I know. If I buy it unlocked, could I pop in my AT&T SIM Card and just use it for calls only? I don't have much knowledge on this and was wondering what you guys know. Thanks.
I found this: http://forums.toucharcade.com/showthread.php?t=64728 Which is probably what your looking for.
