Now, staying on top of your AT&T accounts is much easier with the myAT&T app. • Check data usage: Want to keep tabs on your wireless or Internet data usage? Open the app to check usage on the overview screen. Or, use our today view widget to keep it constantly visible. • Pay your bill: Never miss another payment. View/pay your bill in the app. Tell us how and when, and we'll let you know when your bill is ready. • Upgrade your phone or plan: Pick it up in the store, or have it delivered to you. You can also make changes to your plan right from the app.