From the Settings app, tap Network & internet.
Tap Data Manager.
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.
Drag the Warning bar to your prefered data usage warning.
You can also turn off mobile data when you're in areas where you don't want to use any data.
Tap or slide the Limit mobile data usage switch to ON.
Tap OK.
Drag the Limit bar to your prefered data usage limit.
You've completed the steps!
