Clarification for future readers of this post that might be considering Ubuntu Touch in Canada: All 3 major Canadian networks have stated that they're maintaining 3G until December 2025. Different story in the USA, where at different points in 2022, the major networks discontinued 3G.
In Canada, Ubuntu Touch is very much usable as a phone. Telephone calls, SMS, MMS photos, audio, and video all work as expected for me. (Group texts do not, and MMS has caused me plenty of headaches in general, though I think I've got a stable setup now.)
Hopefully VOLTE can work soon. I'm much too inept to be of use in that quest other than to keep donating to UBports and crossing my fingers. My enduring gratitude to those working to make UT better. It's already improved considerably since I started using it in late 2020.
@mrt10001 Success! I tried what you suggested but I had no luck. I tried what the twrp site said and again no luck. I flashed Android v9 and started again. And that worked. Thanks so much for your help, MrT; it got me started!
If anyone needs it, here is the link to bring a Pixel back to a fresh official Google Android state (worked on my Pixel 2 XL [after many failed attempts to get TWRP installed for Andriod alternatives]). https://developers.google.com/android/images
@roger-ramjet Have a look here and read through the link in the first post https://forums.ubports.com/topic/7568/install-ut-on-google-pixel-3a-xl/29 See if it makes things clearer.
You will need a specific version for your device but the instructions should make that clear and have all the links you need. Make sure you take your time and you will be ok. Any issues or further questions just ask and someone will reply as soon as they can.