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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 "Data roaming"
Press SIM cards & mobile networks.
Press Advanced settings.
Press Data roaming.
2. Turn data roaming on or off
Press the drop down list next to "International roaming".
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.