Towards GNOME Shell on mobile
As part of the design process for what ended up becoming GNOME 40 the design team worked on a number of experimental concepts, a few of which were aimed at better support for tablets and other smaller devices. Ever since then, some of us have been thinking about what it would take to fully port GNOME Shell to a phone form factor.
Say about GNOME what you want, but this looks kind of amazing. Of course, the issue will always be application support - or lack thereof - but as a UI for a true Linux smartphone, this is totally workable.