Hey all, I bet this has been covered at least a little bit on this forum before, but I couldn't find the specific information I was looking for, so here we are! I want to buy a 3Gs, and I am eligible for my upgrade. I will be switching from a Blackberry, which I love dearly, but I feel like it's time for some iPhone action. My question is this: if I get the iPhone, am I in a contract with Apple as well as AT&T? What I mean is, say 6 months down the line, I decide the 3Gs isn't exactly working out, and I decide I want to go back to my Curve. The people at AT&T said the plans cost the same, so could I just pull the sim from my 3Gs and pop it into my BB, go to the AT&T store and switch the plans? Would that fly? Note: I remember switching back and forth between my Edge iPhone and my Curve pretty easily. The folks at AT&T said it was different now, though, with the 3Gs. So I sign the 2 year contract agreement when I purchase the iPhone - does that limit me to the iPhone for those 2 years? Also, if I can switch back to my BB, would the 3Gs still function as an iPod? I have heard mixed reviews on this - some people say it needs a sim to function at all. I hope I am wording my concerns correctly. Please let me know what you think. Thanks!