1. Find "SIM card settings"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press SIM card & mobile network.
Press SIM card settings.
2. Turn Wi-Fi calling on or off
Press the name of the SIM.
Press Wi-Fi calling.
Press the indicator to turn the function on or off.
3. Return to the home screen
Press the Home key to return to the home screen.