my general answer to this would be PostmarketOS, but it's just personal bias ;)
Linux Phones
Community about running GNU/Linux on phones. Projects like Ubuntu Touch, Plasma Mobile, PostmarketOS, Mobian etc. Either on former Android phones or hardware like the PinePhone.
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PostmarketOS is probably the largest one you'll find. It supports a huge range of devices, some better some worse. You might have worse driver support and fewer features on newer devices, because PostmarketOS is focused on using the upstream kernel with minimal patches.
Most other mobile Linux distributions use Halium as a translation layer between the Android core and Linux userspace. More stuff might work, but you're still using the ancient Android kernel and proprietary drivers.
Written from my Fairphone 5 I got yesterday to put PostmarketOS on it.
If you don't mind me asking, where did you get and how much did you pay for your Fairphone 5?
I got it used from a local online store. 240 CHF that's ~265 EUR or ~300 USD
Fellow swiss guy apparently. It means I ain’t the only one on Lemmy and the only one interested in Linux phones. We might be 2 in the entire country😅
Ubuntu Touch will probably have the lowest friction as most things work on it as it reuses the Android drivers.
But on carefully selected devices PostmarketOS or Mobian can work.