I recently bought an 8GB iPhone from someone I know who didn't like the iPhone coverage. I have a Sony Ericsson w580i walkman phone and was hoping that i could take the SIM card out of it and put it into my iPhone, so that i wouldn't have to get the iPhone data plan. When i put the SIM card into the iPhone it gave me the emergency call screen. iTunes wanted me to activate it using iTunes, but I was afraid that it would give me the iPhone will plan (with the larger monthly bill), so instead I jailbroke it with QuickPwn. Now I can use the camera, iPod, etc., but I couldn't use text or call. In the corner that would normally say AT&T it just shows 1 bar (i guess its connected to something) and no carrier. Help! Please.