plasma-dialer doesn't call

[dcinoz]

If the preinstalled version was older than beta 9, then it was based on ofono. So if you upgraded it to the latest, then it was replaced with modemmanager.
There could be leftover ofono files, but they should not be in use.
I'd suggest to flash latest - beta11 to a SD card and do a fresh start. Or test any other OS. If you are satisfied, install it to a internal memory.

I tried the latest dev image Manjaro-ARM-plasma-mobile-dev-pinephone-20220304 and even with data on (otherwise turns off modem), I was unable to make calls or send text messages, I don't believe the telephony stack works properly with ModemManager yet. The modem was on and responded to AT commands via mmcli.

Make sure modem is on with:
mmcli -m any -e
check eg with
mmcli -m any --messaging-list-sms
mmcli -m any --command='AT+QCFG="ims"'

I downgraded to the stable branch and had the same problems.

I booted back to Mobian on SD card and everything works for me, though I think there are still some missed calls / SMS notifications when in suspend mode. This is with the latest Quectel firmware, I haven't tried with Biktorgj one.

I'm on a non-VoLTE MVNO.

Hopefully it gets fixed eventually, annoying the when the phone part doesn't work (reliably).