From the Settings screen, tap Connections.
Tap Data usage.
Tap Mobile data usage.
You can also turn off mobile data when you're in areas where you don't want to use any data.
Tap the Settings icon.
Tap or slide the Set data warning switch to ON.
From this screen, you can limit your data usage and set up alerts for when you're reaching your data usage limits for the current month.
Tap Data warning.
Enter your prefered data usage warning.
Tap Set.
Tap or slide the Set data limit to ON.
Tap Data limit.
Enter your preferred data usage limit.
Tap Set.
Tap Start billing cycle on.
Select a new usage cycle reset date.
We recommend you match this date to the date you Billing Cycle starts to more accurately manage your data
Tap Set.
You've completed the steps!
