

I mean, you could approximate a phone with a lot of SBCs out there right now, if you stuck a screen onto it. A lot of them even have SIM modules. If somebody wanted to go full hacker you could probably 3D print a case for something like a Banana Pi, stick a cheap touchscreen OLED panel in there and Frankenstein up a battery. Would be a lot of work though and I’m sure getting all the shit working would be nontrivial.
But think of the street cred!