Sorry to post another similar thread but I can't seem to figure out if this would work. I currently have 2 unlimited data that both have upgrades available. I am trying to upgrade to the 5s and keep my unlimited data but the 2nd line does not use much data so it would be fine to take away that line's unlimited data. So I am assuming I would use Line #2 to buy my 5s, activate on that line, and then reactivate on my line. Would I still have my own upgrade available once the phone is transferred to my line? I just want to make sure I would be able to transfer my upgrade eventually so that line #2 can get a new phone at some point. But I wasn't sure how often you could upgrade the same line.