Sorry to dredge, but I was wondering about this... right now, the two year contract for the iPhone has essentially nothing to do with purchasing it, in the sense that you can buy it from Apple without any contract, but then you get into a contract as soon as you activate it and pick a plan.
So...
1) If and when the refurbs come out, will they require a two year contract also? It seems like they might... if the refurbs were even modestly discounted from new, though, without the need for a contract, now that would be amazing.
2) If you decide in a month you don't want your iPhone (or in two years), and you pay the contract break if necessary, you can sell your iPhone, right? But from what I understand, that new person will have to sign up for a new two year contract from AT&T starting on the day they activate their used iPhone?
I know this stuff is still being hashed out, but either way, it makes the used market very different from the used market for any other cell phone, locked or unlocked. Even if a cell is locked, if you have service with that company already, you can start using it without a new contract.