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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 connection settings"
Press the Left selection key.
Select Data connection settings.
2. Turn mobile data on or off
Select the required setting.
3. Return to the home screen
Press the Home key to return to the home screen.