Great link, thank you. I'm so used to desperately trying to make this old 3a work that I didn't realize they'd listed out support expectations for more recent models.

That's what I expected, but had hoped there would be additional legacy support. Google previously only supported Pixels for 3 years, right? They may be more competitive with Apple now, but that's still only 6-7 years. In that case, if I buy an old Pixel on ebay it's not likely to have much of a run left.

My issues with Lineage are related, although they obviously try to give legacy support (perhaps without the ability to make full security updates), but we still run into functionality issues like my lack of wi-fi calling. I don't think that is so much about the age of the phone as it is due to tech/frequency updates that are non-compatible with some older devices, and proprietary opaqueness in the Google code. I wish Lineage would at least list this issue on their wiki, phone by phone, as that would make it easier for me to decide on my next step.

I hear a tiny dev team made some VoLTE progress in the Linux world, but I am way over my head in trying to understand exactly what's going on. I think they've got an Ubuntu Touch device working with VoLTE for the first time? Does it work in the US? Does it have Wi-fi calling? I have many questions but need to keep reading. (I know VoLTE is different from VoWiFi, but I see them used interchangeably at times.)