Huawei P smart 2019
Android 9.0
Select help topic
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
Press the Home key to return to the home screen.