You can limit your data usage when abroad by deactivating data roaming. No connection to the Internet via the mobile network when abroad can then be established. You can still use WLAN even though data roaming is deactivated. Remember, you need to activate mobile data.
Find " Mobile Network"
Slide your finger down the display starting from the top edge of your mobile phone.
Press Network Connections.
Press Mobile Network.
Activate or deactivate data roaming
Press the drop down list below "Data services while roaming".
Press On, Off or Prompt.
Return to the home screen
Slide your finger up the display starting from the bottom edge of your mobile phone to return to the home screen.