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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 data"
Press Mobile network.
Press Mobile data.
2. Turn data roaming on or off
Press the indicator next to "Data roaming" below the required SIM to turn the function on or off.
If you turn on the function, press OK.
3. Return to the home screen
Press the Home key to return to the home screen.