Picking up my iPhone 5 from Apple Store later today, I used another family members line to upgrade, and would like to swap. I've been reading the forums and have seen many people having problems with the upgrade swap. Can Apple do it in the store or do I have to keep the phone off till I get to ATT? Also will I need the other members phone as well? I just don't want to do anything wrong and cause my family members line to be deactivated, etc.