I grew up with my brother throwing used computer parts on my bed whenever he upgraded something, in case I wanted to reuse them. He also gave me a copy of Windows 98, and later XP that I reused every time I did a major hw upgrade. But one day the XP CD-rom was just too old, but I was too young to start working and had no money, and so Linux came into my life.
It will affect most of the world in a few years. Lurk around in the forum, and you’ll find some posts about which phones and carriers work well in the US. (I assume that’s where Chicagoland is?) VoLTE is enabled on an experimental basis for several phones running UT now.
I wouldn’t do Ubuntu Touch on the P3a if you’re in an area where VoLTE is required. It seems this model is too old to get the treatment it needs.
Ubuntu Touch doesn’t officially support it yet, but it is working reliably for several phones now.
I daily drive Ubuntu Touch on a Fairphone 5. It’s not without quirks, but I like the experience. Many practical and nice native apps, Android app support through Waydroid, banking and things that would require Google Play verification I solve through the browser. Fairly good battery life, VoLTE is solved for the FP5 and some other models (which has been an issue with many Linux phones) and the community is very active solving issues and helping each other day and night.
I daily drive Ubuntu touch and like it very much, but I can see how that would be hard in certain situations. Keep doing some research, and pick one that seems to fit your needs to try it out! Only you can decide if it is good enough for your particular circumstances.