sudo apt install bm818-tools
That will add an icon to your main screen. Launch that application. Touch the checkbox for VoLTE.
To be on the safe side I would then reboot the phone before attempting to make a call.
sudo apt install bm818-tools
That will add an icon to your main screen. Launch that application. Touch the checkbox for VoLTE.
To be on the safe side I would then reboot the phone before attempting to make a call.