From the Settings app, tap Connections.
Tap Data usage.
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 & limit.
You can also turn off mobile data when you're in areas where you don't want to use any data.
Tap Cellular data usage cycle.
Select your preferred data 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.
Tap or slide the Alert me switch to ON.
Tap OK.
Tap Data warning.
Enter your preferred data usage warning.
Tap SET.
Tap or slide the Set data limit switch to ON.
Tap OK.
Tap Data limit.
Enter your preferred data usage limit.
Tap SET.
You've completed the steps!
