Sony Xperia 5 III
Android 11.0
1. Find "Mobile network"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network and Internet.
Press Mobile network.
2. Turn VoLTE on or off
Press the indicator next to "4G Calling" to turn the function on or off.
3. Return to the home screen
Press the Home key to return to the home screen.