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You can limit your data usage by turning off mobile data. You'll then not be able to access the internet using the mobile network. You can still use Wi-Fi even though mobile data is turned off.
1. Find "Mobile network"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network & Internet.
Press Mobile network.
2. Turn mobile data on or off
Press the required SIM.
Press the indicator next to "Mobile data".
3. Return to the home screen
Press the Home key to return to the home screen.