You're overestimating the Volla phone and Fairphone, 1st one still doesn't support VoLTE which I heard is essential in the US, 2nd thing isn't even recommended by UT.[1]
Either go with an Xperia + SailfishOS [2] if you want more than a toy or Pinephone + PmOs [3] if you love to tinker on your daily driver. Both have VoLTE support.
1. https://devices.ubuntu-touch.io/
3. https://wiki.postmarketos.org/wiki/PINE64_PinePhone_(pine64-...
FP2 is the second device on the "promoted" devices page. That feels like a recommendation?
https://ubports.com/supported-products
> Google Pixel 3a/3a XL.
Doesn't support one of the most interesting features to me in UBports, which is display output for convergence.
The FP2 is a very old device lacking some features and probably got recommendation back then because other devices were worse. https://devices.ubuntu-touch.io/device/fp2 Otherwise I'd also could have recommended the Nexus5.
On FOSDEM 2023 Ubports developers didn't show off this old phone, either.