I currently have an iPhone 3G. I got an iPhone 4 for Christmas from my mom. She told me the AT&T employee told her that it would have to be activated/switched over in-store. He didn't say why. My first question is why do we have to go to the store? Or, what are some possible reasons? Secondly, I do have a jailbroken phone. Should this be an issue? Should I unjailbreak it (if possible) before I go? I mean will my current phone be turned on or will the sim card just be removed? Help is much appreciated.