I just recently found this on the pulse audio website and I am currently on Mobian Phosh. After I switched the Mic to Capture, not Master, It worked much better and then I just lowered the volume of the mic to 50%. If I powered the phone off, I would have to reset the mic settings again. It is a strange fix, but it worked for me after trying a few other things which I had no success. I hope that helps. I also do not use a sim card, but a voip in the Calls app.
https://wiki.archlinux.org/title/PulseAu...leshooting
https://wiki.archlinux.org/title/PulseAu...leshooting