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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 two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network & Internet.
Press Mobile network.
2. Turn data roaming on or off
Press the required SIM.
Press the indicator next to "Roaming" to turn the function on or off.
If you turn on the function, press OK.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.