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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 "Mobile Network"
Slide your finger downwards starting from the top of the screen.
Press Networks and Connections.
Press Mobile Network.
2. Turn data roaming on or off
Press the field below "Data services while roaming".
Press the required setting.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.