At the risk of going OT:
https://en.wikipedia.org/wiki/List_of_open-source_mobile_phones
Purism and Pine64 kicked off the latest round of interest in 2019 and are still selling phones. Fairphone weren't originally interested in the free software side, but moved towards it partly because of customers asking for it, and partly because it helped them provide software updates for longer. None of these are exactly 'normal' phone manufacturers. I'm not familiar with the Volla phones.
In the software side the biggest are probably the AOSP derivatives LineageOS and
/e/ which target Android phone hardware with unlocked bootloaders. It's arguable whether these count as Android or not as they don't have the Google bits like the Play Store unless you decide to install them. CopperheadOS and GrapheneOS are in a similar space.
Some linux varieties target the Android hardware too, via libhybris in cases where the drivers are closed. There are phone-specific distros like
postmarketOS,
mobian and
ubports, as well as more generic distros that can run on phones.
https://wiki.pine64.org/wiki/PinePhone_Software_Releases covers most of them.
Like I said it's a small market, and mostly needs a fair bit of skill to install. I think /e/ sell some pre-installed. The linux side still needs a fair bit of work too, but for some the benefits outweigh the drawbacks. Anbox and Waydroid provide some ability to run Android apps, but like Wine they can't run everything.
There's also KaiOS, based on Firefox OS and running on feature phones.