Re: It's a phone
Installation on iDevices is not currently possible as far as I'm aware. It was muted but this is Apple & they don't play well with others, especially as you're not only breaking the iOS shell you're getting the powerful little box to work with something which has nothing to do with Cupertino & that is a threat to the bottom line.
I've been using Ubuntu Touch/UBPorts since the native BQ Aquaris E4.5 was launched about 8 years ago. As intimated elsewhere it's always been not quite ready for primetime - web apps have a nice way of breaking the addictive design of social media's biggest sites, but they mostly still work, more or less.
Calls/texts/emails on the BQ were fine, some reception issues which couldn't be blamed on coverage but otherwise perfectly functional & the contacts app has the option of plugging into your Google account if you want, it uses the same account provider process as desktop Ubuntu/Gnome.
Obliterating Android & putting UBPorts on an LG Nexus5 was very easy, the non-Canonical UBports had left some apps behind as it moved from 14.04 to 16.04 base but the phone was solid enough & survived, 2nd hand, for about 3 years until common N5 hardware issues started cropping up: mic failure on standard hold-it-to-your-ear calls then the screen started to blank at odd occasions & more frequently. Not Nokia quality.
Installing on my current phone, Xiaomi Mi A2, was a chore. It took me a couple of months to get the bits in the right place but that is likely to be as much to do with using Ubuntu 18.04 on my laptop in 2021 as it does with the special hoops Xiaomi need you to jump through to get around Android. It took me another month to be motivated to sort out mobile data but that was just a settings issue as copying over my /home folder (for SMS message cache, call history, contacts, system & app settings) had brought over Nexus settings & confused things.
Aside from a few quirks around rebooting the phone is solid as a phone & for text messages or email. The camera freezes sometimes & media uploads to social media can be hit and miss - but that's not why I have the phone.
Full disclosure, I also have a first edition iPhone SE for work stuff & the kinds of things you can't web-app; bus fare & banking apps, stuff work want me to have and WhatsApp. There's a web app for WhatsApp but it needs to be logged in on a native app to work & for some reason /everyone/ thinks everyone else has it.
In summary; worth it if you aren't going to get frustrated that many things don't work as smoothly & some closed source things don't work at all. I've found it to be a good way to extend the life of cheaper 2nd hand phones at a fraction of the cost of new & flashy. It works, and you may get some of your life back.
Yes, there is some element of not wanting random network traffic reporting home & I appreciate that by using social media I am then generating that traffic. But that is my choice to do so.