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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 "Connections"
Press the Navigation key.
2. Turn data roaming on or off
Select Data roaming to turn the function on or off.
3. Return to the home screen
Press Disconnect to return to the home screen.