I'm using my mom's upgrade for the iPhone 4. So the MicroSIM in the phone is going to have her number. If I call them, explain my situation, will they mail me a MicroSIM? Or do I have to go to the AT&T store the day my iPhone 4 arrives? I really want to avoid going to the store. They usually make things complicated. Edit: Whoa! What happened to my title? Sorry guys!