On my old phone I had an issue with the proximity sensor and front facing camera. This led me to holding my phone backwards to take photos and being unable to hang up phone calls.
I think I put up with this for a year and a half.
I did end up figuring out the issue with the proximity sensor but opening up my phone to reconnect the camera module was too much effort for me.
I used an Ubuntu Phone as my daily for about 6 months.
And how was it
Quite bad. This was over 10 years ago so the details are muddy… It was on BQ hardware and the first weeks it couldn’t even work outside on GSM or 3G (or whatever was at the time). It was clearly developed and tested solely on Wifi. Using cellular connection make it fall apart and constantly hang.
Then it never was able to get WhatsApp working. Everyone uses WhatsApp, and had to get by using old SMS or whoever I got to trick to install the then unknown Telegram.
Eventually got tired and got back to an Android phone. An Alcatel if I recall correctly.
After some time, BQ offered a way to revert the hardware back to its Android version, did that and had a backup for many years.
It was a very messy and buggy launch, but being on the bleeding edge, it’s expected. If they had offered a WhatsApp app I would have hung on way longer, it was the only deal breaker.