The FSF's Librephone project

The Free Software Foundation has announced the launch
of the Librephone project, which is aimed at the creation of a fully-free
operating system for mobile devices.

Practically, Librephone aims to close the last gaps between
existing distributions of the Android operating system and software
freedom. The FSF has hired experienced developer Rob Savoye
(DejaGNU, Gnash, OpenStreetMap, and more) to lead the technical
project. He is currently investigating the state of device firmware
and binary blobs in other mobile phone freedom projects,
prioritizing the free software work done by the not entirely free
software mobile phone operating system LineageOS.