So, with the purchase of my new iPhone, I am looking to sell my iPhone 6 Plus. Through some, not-so-in-depth research, obviously unlocked phones usually carry a higher resale value. So, I wiped out my old iPhone once I listed it for sale, and shortly learned about AT&T's customer unlock service. So, I got the approval for the unlock, but the steps from AT&T say to restore the phone, is that necessary for the unlock to occur, or is it already unlocked, and whoever restores the phone next (buyer) will have an unlocked iPhone? Thanks.