View data usage, set data limits, change your billing cycle, and see the apps using the most data.
 Dial *data# (*3282#) on your mobile phone to check your current bill cycle's data usage.
In this tutorial, you will learn how to:
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• View data usage
• View data usage by app
• Change displayed billing cycle
• Set data warning or data limit
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1. Swipe down from the Notification bar, then select the  Settings icon.
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2. Select Connections, then select Data usage.
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3. Select Mobile data usage. Mobile data usage will be displayed.
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From the Mobile data usage screen, scroll to view data usage broken down by application.
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Note: To restrict apps from using data while running in the background, swipe down from the Notification bar, then select the  Settings icon > Connections > Data usage > Data saver > Turn on now switch. Your myAT&T account is also another way to manage your wireless usage.
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From the Mobile data usage screen, select the Data usage cycle drop-down then select the desired billing cycle.
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1. From the Mobile data usage screen, select the  Settings icon.
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2. Select the desired option.
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• SET BILLING CYCLE START: Select Start billing cycle on.
• ENABLE/DISABLE DATA WARNING: Select the Set data warning switch.
• SET DATA WARNING: When the Data warning switch is enabled, select Data warning.
• ENABLE/DISABLE DATA LIMIT: Select the Set data limit switch.
• SET DATA LIMIT: When the Data limit switch is enabled, select Data limit.
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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.