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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 "Data service"
Press the Navigation key.
Select Data service.
2. Turn mobile data on or off
Select the required setting to turn the function on or off.
3. Return to the home screen
Press Disconnect to return to the home screen.