The price of the phone is then spread across equally in 30 monthly installments.
If you cancel your AT&T service before your device is paid off in full, you will be required to pay the outstanding balance.
Below is a quick comparison between the costs of buying a Samsung Galaxy S8 through Next with a 30-month upgrade option and buying the same device on the same plan, but at full price upfront (spoiler: you're actually paying about the same in total with each option).
before you've paid off your old phone in full), you need to hand in your old device when you sign up for your new phone.
So you can't, for example, get a new phone and need to sign an installment agreement for the repayment period.
If neither of these steps resolves the issue, try our Troubleshooting Assistant.