Hi. It's too soon for me to upgrade my 4S without paying an early upgrade fee ($250). Is it possible for me to use someone else's subsidy to upgrade early without incurring an additional fee? If so, how is that done (via Apple or do you have to buy the phone from the carrier to do that)? Does the other person have to be present or can they authorize it remotely (like over the phone)? Thanks. Edit: we're both on AT&T. Other person gets my 4S out of the deal.