From the Settings app, tap Network and Internet.
Tap Mobile network.
Tap App data usage.
Tap the Settings icon.
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 or slide the Set data warning switch to ON.
Tap the Data warning field.
Tap the Set data usage warning field.
Enter your prefered data usage warning.
Tap Set.
Tap or slide the Set data limit switch to ON.
Tap OK.
Tap Data limit.
Tap the Set data usage limit field.
Enter your preferred data usage limit.
Tap Set.
Tap Mobile data usage cycle.
Select a new usage cycle reset date.
We recommend you match this date to the date your carrier's Billing Cycle starts to more accurately manage your data.
Tap Set.
You've completed the steps!
