Call 611 from your AT&T device or 800.901.9878 from any phone. When prompted, say "Buy add-ons" and follow the instructions to select a data package.

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)

Buying data for an (formerly GoPhone) account is primarily done through "Add-Ons," which allow you to supplement your existing plan's data limit. As of April 2026, the standard rate for additional data is $10 for 5GB . How to Buy Data Add-Ons You can purchase extra data using these three methods:

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