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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. Remember, you need to turn on mobile data.
Find "Mobile Network"
Slide your finger downwards starting from the top edge of the display.
Press Network Connections.
Press Mobile Network.
Turn data roaming on or off
Press the drop down list below "Data services while roaming".
Press On, Off or Prompt.
Return to the home screen
Slide your finger upwards starting from the bottom edge of the display to return to the home screen.