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You can limit your data usage when abroad by turning off data roaming. You'll then not be able to access the internet using the mobile network when abroad. You can still use Wi-Fi even though data roaming is turned off.
1. Find "Roaming Mode"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press SIM card & mobile network.
Press Mobile network.
Press Roaming Mode.
2. Turn data roaming on or off
Press the required setting to turn the function on or off.
3. Return to the home screen
Press the Home key to return to the home screen.