https://maruos.com/
https://en.wikipedia.org/wiki/Ubuntu_Edge
Connect your phone to a display, mouse, keyboard and get a full desktop experience.
At the time smartphones were not powerful enough, cables were fiddly (adapters, HDMI, USB A instead of a single USB c cable) and virtualization and containers not quite there.
Today, going via pkvm seems like promising approach. Seamless sharing of data, apps etc. will take some work, though.