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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 Mobile network.
Press the required SIM.
Press Wi-Fi Calling.
Press the indicator next to 'Wi-Fi Calling' to turn the function on or off.
Press the Home key to return to the home screen.
Press About device.
Press the first field. If a new software version is available, it's displayed. Follow the instructions on the screen to update the phone software.
Press the Side key.
Simultaneously, press and hold the Top volume key and keep them both pressed until your phone restarts.