Tap Data usage to access the following:
Mobile data: Slide the button on the Mobile data switch to the right to enable mobile data.
Set mobile data limit: Checkmark to limit your mobile data. Your mobile data connection will be disabled when you reach the limit you set.
Data usage cycle: Displays your current data usage cycle. Tap the drop-down menu icon to change the cycle date.
Data usage graphic: Displays your data usage on a graph which allows you to move your data limit on the graph if you checkmark the Set mobile data limit setting.
Data usage applications: Applications are displayed with their data usage on a bar graph. Tap one to see more detailed information.