List of free, open source smartphone operating systems

Updated: August 29, 2025

I hope to experiment with these, post some experiences, and move away from closed-source big vendor smartphone operating systems. The most interesting device might be a Fairphone running Ubuntu Touch. Also considering an old cheap Pixel phone running Ubuntu Touch or postmarketOS for experimentation before moving to a more expensive daily driver.

Devices

This is an incomplete list of devices commonly supported by above mobile operating systems. There are many more but these seem to be more recent.