Hi, i'm new to this site so i'm not sure if this has been posted or not. I'm currently on the Family Plan along with 2 other lines. I wasn't eligible for an upgrade so I ordered the iPhone with my mom's eligibility, which should get here Tuesday. What I plan to do is just put my sim card in because the last phone I got came with a 3g sim card, would it work that way? I understand about the data plan, so would I have to get that removed from my mom's line and switched over to mine or what? If so, can this be done over the phone or in store? Thanks so much for your help.