Stupid question maybe, but I can't seem to find the fine print on this. If I buy an iPhone 6 with AT&T Next, and complete ALL the payments, am I correct that I do not need to trade it in at that point to start a new Next plan on a new phone? Seems obvious the answer should be no I do not, because I own that phone now, but with these companies who knows. After I pay it off, I should be able to sell my 6 privately and start a new Next plan right? Alternately considering just buying the phone upfront, which works out to the same overall cost, minus the option to upgrade early.