No. The only exceptions to making additional payments are:
- To pay off your device. You can pay off your entire device payment agreement balance any time.
- Customers on eligible Apple devices or Samsung devices can make the required payment to complete your annual upgrade.
- Customers on device payment agreements established before 5/31/15 (formerly called Edge Up) can make the required payment to complete your upgrade.
From # 3 under Device Payment Agreement and Making Installment Payments at