So I was watching the October 27th WAN show, and heard Dan's mini rant on Canada carriers and VoLTE. I am also a big fan of Sony phones, however I live in the US where it mostly just works, unless you have an older (pre-2019) phone. Recently, I was able to hack T-Mobile VoLTE onto a Xperia XA2. This got me thinking about that WAN show episode, and after and doing a bit more research into how VoLTE works on Sony phones, I believe I should be able to get VoLTE working on at least one of the carriers. A MVNO would probably be better instead a carrier just in case they have weird activation policies or IMEI checking. Most MVNOs don't really care from what I see, at least in the US.
I would like to get into contact with Dan about this. If that's not possible, I could post generic instructions here, but it would be faster and easier if I knew what device(s) and carrier(s) with a direct line of communication.