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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 network"
Slide your finger left across the display to open the main menu.
Press mobile network.
2. Turn mobile data on or off
Press the field below "Data connection".
Press on or off.
3. Return to the home screen
Press the Home key to return to the home screen.