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Other ways to get help
If you can't use WiFi Calling, there may be several causes of the problem.
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calls.
Press Wi-Fi Calling.
Press the indicator to turn the function on or off.
Press the Home key to return to the home screen.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press System.
Press Advanced.
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 On/Off.
Simultaneously, press and hold the lower part of the Volume key until your phone restarts.