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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 usage"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Data usage.
2. Turn mobile data on or off
Press the indicator next to "Mobile data" to turn the function on or off.
If you turn off the function, press OK.
3. Return to the home screen
Press the Home key to return to the home screen.