It's FOSS - https://itsfoss.com/librem-5-gnome-kde/
Brief: Purism is making a true Linux smartphone called Librem 5. KDE and GNOME have just lent their support for Librem 5.
You probably already know that Purism has launched a crowdfunding campaign in a bid to create a Linux smartphone. The goal is to raise $1.5 million to bring the world’s first truly free and open source smartphone with enhanced user protection and end-to-end encryption into the market.
Librem 5 wants you to be able to run any major Linux distributions such as Debian, Arch, Ubuntu etc on your smartphone. And to support this ‘dream’, two big Linux desktop projects,