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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 "Dual SIM & Cellular"
Press Dual SIM & Cellular.
2. Turn data roaming on or off
Press the indicator next to "Data Roaming".
If you turn on the function, press On.
3. Return to the home screen
Press the Home key to return to the home screen.