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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. Turn mobile data on or off
Slide two fingers downwards starting from the top of the screen.
Press the drop down list below the mobile data icon.
Press the indicator next to "Mobile data" to turn the function on or off.
2. Return to the home screen
Press the Home key to return to the home screen.