@vverve Thanks for testing further and reporting. I'm still on 20.04 and as this is my daily driver, used for my contracting business, have been hesitant to update.
I think that in short it's still unknown whether this device will get working VoLTE or not. Ruben has done great work on the port, but it's just one person maintaining it as far as I understand. I don't have much sense how much work it is, but had heard that it may be hard or impossible on Anroid 10 based ports like this one? But I'm really not sure.
I haven't seen anything about when Fizz/Vidéotron will end 3G (je suis aussi Canadien, d'Ontario). But out of network, Rogers already has, Telus is ending it in December, and Bell not til December 2026. So it could become more of an issue when roaming outside Vidéotron's network.
The Gitlab page is https://gitlab.com/ubports/porting/community-ports/android10/oneplus-nord-n10/oneplus-billie
I don't notice anythimg pertinent there, but am not really savvy enough to know.
If I hear anything on the Telegram channel, I'll post about it here.