I am completely new to jailbreaking/unlocking iphones, have only jailbroken an ipod touch before. I live in the US (ATT) and recently bought an iphone 3g from someone in canada, locked to Rogers. I know I have to unlock it so I can use it with ATT, and my question is, during the jailbreaking or unlocking process, am I going to have to access the springboard at any time? Because I am scared that whenever I turn on the iphone its going to say something like "insert a rogers sim card or you cant use the phone" and then I wont even be able to do anything with it. Should I buy a rogers sim card from somewhere just to be safe?