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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"
Select the menu icon.
Select Network & Internet.
Select Mobile network.
2. Turn data roaming on or off
Select the indicator next to "Roaming" to turn the function on or off.
If you turn on the function, select OK.
3. Return to the home screen
Press Disconnect to return to the home screen.