Comment by sambuccid

- https://sailfishos.org - https://docs.sailfishos.org/Support/Supported_Devices

They have few devices of their own (new one coming out this October) and they officially support many Sony Xperia devices. There are also many community ports.

- https://ubuntu-touch.io - https://devices.ubuntu-touch.io

They have 33 supported devices, some are being shipped directly with the OS or have an official agreement with the phone maker, while others are community ports. Even if community ports, they all seem to have high hardware support, and is all very clearly documented.

- https://puri.sm/products/librem-5 / https://pureos.net

They focus just on the Librem 5, and not everything is fully working but as I said they prioritised privacy and FOSS. The phone is old but the OS is still in active development.

- https://postmarketos.org - https://wiki.postmarketos.org/wiki/Devices

They focus on supporting as many devices as possible, currently they don't have "main" devices they support, but they plan to. They too have a very clear documentation on features available for each device.

- https://mobian.org - https://wiki.debian.org/Mobian/Devices

They target devices made with the intent of running linux, but also have a few ports to android devices.

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You'll notice that there are a few devices that are more "linux-friendly" and that are supported by many of these OSes. Phones from Pinephone and Fairphone being the main ones.