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If you can't use WiFi Calling, there may be several causes of the problem.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network and Internet.
Press Mobile network.
Press the name of the SIM.
Press Advanced.
Press Wi-Fi Calling.
Press the indicator next to 'Use Wi-Fi calling' to turn the function on or off.
Press the Home key to return to the home screen.
Press System.
Press System update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the phone software.
Press and hold the Side key until your phone restarts.