The loan is for two years, so Citizens will continue to charge monthly payments for the remaining year until you upgrade or pay it off early. From their perspective, they loaned you the amount to purchase the device, and they expect monthly payments until it's paid off or until you upgrade. They don't suspend charging you after one year of payments: they can't suspend payments based on a customer's intent to upgrade. Citizens expects the loan to be paid in full or to be continued on a new device. I'm guessing that if you upgrade this month, they'll apply the 13th payment to the new device (but I don't know that for sure).