Ok so here's my problem: Tonight I went to the AT&T store to by a "Go Phone" because I'm going to sell my current 16gb iPhone. The AT&T guy moved my account/number to the SIM that came with the Go Phone (I didn't realize that I probably could've just taken the SIM out of my iphone and put in the Go Phone until after the fact). Anyway, I want to continue using my iPhone until I sell it but when i put the SIM from the Go Phone in my iPhone it doesn't work (it just says the call failed as soon as i hit the call button)...Do iPhone SIMs work with Go Phones but not the other way around?? The original SIM that's in my iPhone was deactivated when the AT&T moved my info the Go Phone SIM. What should I do?