Huawei P40 Pro
Android 10.0
1. Find "Wi-Fi Calling"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Wi-Fi Calling.
2. Turn Wi-Fi calling on or off
Press the indicator next to "Wi-Fi Calling" to turn the function on or off.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.