1 Find "Advanced"
Slide two fingers downwards starting from the top of the screen.

Press the settings icon.

Press Network and internet.

Press Mobile network.

Press Advanced.

2 Turn Wi-Fi calling on or off
Press Wi-Fi Calling.

Press the indicator next to "Wi-Fi calling" to turn the function on or off.

3 Return to the home screen
Press the Home key to return to the home screen.
