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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 services while roaming"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Network & Internet.
Press Mobile networks.
Press Data services while roaming.
2. Turn data roaming on or off
If you want to turn on data roaming, press On.
If you want to turn off data roaming, press Off.
3. Return to the home screen
Press the Home key to return to the home screen.