Pinephone won't make calls

[Kevin_Kofler]

Plasma Mobile has switched from ofono to ModemManager, so you have to use ModemManager instead of ofono.

The following has been listed in the notes for every update since late December, it is under “Old Issues” by now:

@Strit

Plasma Mobile switch to ModemManager

With the PlaMo Gear 21.12 release, Plasma Mobile is now using ModemManager as the telephony stack. So in order to use SIM capabilities, you need to switch from using oFono to ModemManager.
Fix: Run sudo systemctl disable --now ofono ofonoctl && sudo systemctl enable --now ModemManager. You might have to reboot your phone for Plasma Mobile to pick up this change.