Yeah ‘old phones’ are pretty capable devices.

I’ve wondered for a while if they could be used as an extension to your laptop like the old 80s PCs where you would plug in hardware.

So ‘make it a server’ is the obvious way I guess, and then you could do things like render webpages on there and then stream them as images to your actual computer (like the now shutdown Mighty app), or run ffmpeg on there to convert a video, etc

I've been saving phones in my drawer for years, waiting to combine them to form a "supercomputer".

Any day now!

A couple of old phones and a gaming laptop with a broken screen makes a beast of a cluster