Pinephone is the obvious one, BUT!
Have you heard of FairPhone? These things also make it easy to install other operating systems on them. Also Beter for the climate ig.
I actually have a Pinephone from a few years ago (2 years now I think?). I never used it as a daily driver as it was very slow and had comparatively less features than the iphone and samsung phones i had had previously.
Upon recently deciding on purchasing the Pixel 7a and installing Graphene OS on it, i did heavily consider the Fairphone, but I'm in the US and they only just started to come to our shores. The family plan I'm on wasn't a supported carrier, so that more or less made the decision for me.
The observation about the pinephone and fairphone being more environmentally friendly is intriguing. Care to elaborate a bit please?