1. From the home screen, tap AT&T.
   
2. Tap Usage Manager.
   
3. To view overall data usage, tap Data.
   
4. Data usage will be displayed on the graph. To set a data limit, tap the Set mobile data limit checkbox.
   
5. Tap OK.
   
6. To change the billing cycle, tap the Data usage cycle field.
   
7. Tap Change cycle.
   
8. Tap the Arrow icons to adjust to the desired date.
   
9. Tap Set.
   
10. To view specific app usage, tap Apps.
    
11. Specific app usage will be displayed.