Question: how often are you eligible for an upgrade with at&t?
Answer: Upgrade Eligible4: Once you have paid monthly installments totaling at least 50% of the device's full sales price for AT&T Next Every Year℠ or 80% for AT&T Next®, you can trade in your financed smartphone (or one of the same make/model in fully functional and good physical condition) and upgrade to a new Next contract.