Hi! I finally got an iPhone. Yay! Anyway, I bought the 3G with 3.01 off craigslist and went to AT&T and got a GoPhone pay as you go. I registered for it there. I came home and stuck the sim in my new iPhone and it says 'no service' on the top. The phone is not jailbroken. I read many a thread, searched MRoogle, and get conflicting advice. Some say you don't have to jailbreak if it is an AT&T goPhone sim, and others say you do have to jailbreak it. If it is true that you don't have to jailbreak, then what could I be doing wrong? If I do need to jailbreak, do I need to do anything else? Will that activate it correctly to work with the pay as you go sim? Do I need to change the APN (which I don't really know anything about yet)? Thanks, I'm so excited! help me get this thing to work!