OnePlus Nord
Android 11.0
Select help topic
1. Find "SIM & Network"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Wi-Fi & Network.
Press SIM & Network.
2. Turn data roaming on or off
Press the required SIM.
Press the indicator next to "Roaming" to turn the function on or off.
Press OK.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.