Originally Posted by ironman187
No, they need the proof of purchase for the new phone, not the old one.
That's what I thought too, but when you read the terms and conditions, it's hard to tell if they also need it for the used one to prove you own it and it isn't stolen. And they say if for any reason you don't meet terms and conditions they keep your phone and send you $0. So it's a good thing to make sure before you put your used device in the mail. Once it's in the mail it's gone and you can't get it back.