I had a 3GS but wanted to upgrade to the iPhone4. I was not elligable for an upgrade so I made the idiotic move to add a ghost line. I can not stand the phone. The reception is terrible and the person opposite of the line can not hear any music being played on my phone.. among other things. I am going to cancel the ghost line, and I don't want to return the phone to AT&T. My question is, can I sell the iPhone4 even though I just bought it? Also, can I use my micro sim on a 3GS if I use a micro sim adapter? will it work properly?