If you find yourself frequently buying add-ons, you might consider switching to a plan with more built-in data: Add, Change, or Remove AT&T Prepaid Add-Ons

You can purchase refill cards from retailers like Walmart or Best Buy to add a balance to your account, which can then be used to buy the add-on. Popular Data Plan Options (2026)

Sign in to your AT&T Prepaid account , select Manage Prepaid account , then navigate to Add-Ons to choose and purchase your data.