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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 networks"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Mobile networks.
2. Turn data roaming on or off
Press the indicator next to "Data roaming" to turn the function on or off.
If you turn on data roaming, press YES.
3. Return to the home screen
Press the Home key to return to the home screen.