you could ping the 3 users that wrote in the documentation feedback thread for the device as to their experiences to gauge chances of success (version, carrier).
If there is a successful IMS registration with the device<->carrier pair already and even available voice (VoLTE), wificall can’t be far off. You’ll find those details a few steps into the infamous 4636 menu. Or if the Dialer still crashes as you said, there’s an adb activity for it to call it tethered.