From the Settings app, tap Network & internet.
Tap SIMs.
Tap the SIM you'd like to change the settings for.
Scroll to and tap Data warning & limit.
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.
You can also turn off mobile data when you're in areas where you don't want to use any data.
Tap Data warning.
Enter your preferred data usage warning and tap Set.
Tap or slide the Set data limit switch to ON.
Tap OK.
Tap Data limit.
Enter your preferred data usage limit and tap Set.
Tap Mobile data usage cycle.
Select a new usage cycle reset date and tap Set.
We recommend you match this date to the date your carrier's Billing Cycle starts to more accurately manage your data.
You've completed the steps!
