Webget info about at&t installment plans and installment plans with next up or next up anytime. Learn how to pay off your plan or cancel a next up option. Weblooking to change your wireless carrier and move to at&t? Learn how to keep your current phone & number. Plus, get the best switch deals at at&t. Webyou’ll make 36 monthly installment plan payments. When your device is paid in full, you can upgrade. You won’t need to trade in your old smartphone, unless you’re taking advantage of a promotion that…