I'm having a bit of a braindead moment... Are you "allowed" to sell an iPhone after one year if you bought it subsidized on a two-year contract? AT&T will not unlock the phone if your contract is not done, but can't you just list the phone as being locked to your carrier, and all would be fine? Then just use another family members upgrade and get yourself the newest phone? I sold my one-year-old subsidized 5S through craiglist last year, and the guy complained afterwards and had to pay for some service to unlock it. I figured that's because he was from Europe, and not on AT&T, as I had advertised he needed to be, but was it actually because I did something you're not supposed to do? Are these trade-in services like Gazelle or Amazon not for subsidized phones? How can they offer you more money than you even paid for the phone?