Imported Google Pixel 6, 6 Pro, 6a, 7, 7 Pro, but no support for VoLTE and VoWiFi on your local carriers? There is a non-root solution!
Usually, when you buy a phone that is not officially sold in your country, it cannot work with IMS services of local carriers. Experienced users are used to install Magisk modules, which add the necessary files to the firmware.
However, Korean developer kyujin-cho wrote an app that allows you to enable VoLTE and VoWiFi support on the Pixel 6, 6 Pro, 6a, 7 and 7 Pro without root access using Shizuku!
In short, all you need to do is to configure Shizuku, install 'PixelIMS' app, activate VoLTE in it and reboot the device a couple of times. Then check the IMS status in the internal menu by dialing the code *#*#4636#*#* in the dialer.