1. From the home screen, swipe to, then tap the AT&T Folder.
   Note: To check your current month's data usage dial *data# (*3282#) on your mobile phone to receive a text message with the current bill cycle's usage.
   
2. Tap Usage Manager.
   
3. Tap DATA.
   
4. The data usage summary for the selected billing cycle will be displayed.
   
5. To change the displayed billing cycle, tap the Data usage cycle drop-down.
   
6. Tap to view the desired billing cycle.
   
7. To change the billing cycle start date, tap Change cycle.
   
8. Select the desired date, then tap SET.
   
9. To set a monthly data limit, tap Set mobile data limit.
   Note: When the mobile data limit is active and has been reached, the mobile data block will remain in effect until mobile data is manually re-enabled on the device, the limit threshold is changed to a higher value, or a new data usage cycle begins. If you set data usage limits on your device, they do not communicate with AT&T systems. You will still receive AT&T system generated notifications as you approach your data limits.
   
10. Tap OK.
    
11. Drag the Warning marker up or down to set the level at which you will be warned about your data usage.
    
12. Drag the Limit marker up or down to set the monthly data limit.
    
13. The data warning and limit will save automatically.
    
14. Scroll down to view data usage broken down by app.
    Note: To restrict apps from using data while running in the background, from Settings, tap Data usage > Menu key > Auto-sync apps.