Just uploaded Sailfish_OS-5.0.0.68-s19mps-0.0.1.202506141629. Outgoing voice calls should now work reliably. The memory region overlap and the PWM clock error have been fixed.
It seems that I was wrong about the modem being unable to receive incoming calls via 2G. You should be able to receive calls as long as your provider supports it and the modem is in a working state. However, the sound does not work in incoming calls unless you manually run pactl set-card-profile 0 'Voice Call' in the command line before answering the call. The modem may occasionally crash after a call due to VoLTE being broken.
Some work was also done to enable camera support, but it is not integrated into the UI yet. Only the wide-angle camera is supported right now. Running qcam -s width=1280,height=720 should show a preview using libcamera’s software ISP.