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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+SIM"
Slide your finger downwards starting from the top of the screen.
Press ALL SETTINGS.
2. Turn mobile data on or off
Press the indicator next to "Data connection" to turn the function on or off.
3. Return to the home screen
Press the Home key to return to the home screen.