[andor]

Samsung phones can do that: https://en.wikipedia.org/wiki/Samsung_DeX

Samsung even offered a full Ubuntu desktop for the phones, but stopped supporting it rather quickly.

[indymike]

I sometimes plug in my Android Phone to a USB-C dock (with a keyboard, mouse and monitor) and use it like a desktop. Android has a desktop mode that is actually surprisingly nice. It's like Dex, but doesn't do the remote desktop via USB thing... It just displays on the monitor.