I was on an AT&T Next installment plan for my iPhone 6 Plus, and my wife's iPhone 6; and placed/received a new iPhone 6s Plus and iPhone 6s from APPLE using the AT&T Next upgrade eligibility. No instruction was included on how to return the old phones, no packaging, no directions to take it to the store, etc. In fact, I can't even find reference to those older phones on my AT&T account. So, if I want to pay them off and sell them on my own, I don't know what I owe - and if I want to return them, I don't know where to send them etc. Anyone know how to see those balances so I can decide what to do? Any chance AT&T (who had severe issues getting my accounts authorized for upgrades in their system) screwed it up and doesn't know that they should be getting phones back?