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Other ways to get help
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 & Internet.
Press Mobile network.
Press Advanced.
Press Wi-Fi Calling.
Press the indicator to turn the function on or off.
Press the Home key to return to the home screen.
Press System.
Press System updates. If a new software version is available, it's displayed. Follow the instructions on the screen to update the phone software.
Press and hold On/Off until your phone restarts.