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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. Turn data roaming on or off
Slide two fingers downwards starting from the top of the screen.
Press the data roaming icon to turn the function on or off.
2. Return to the home screen
Press the Home key to return to the home screen.