All phones eventually become obsolete, but their guts could be used in so many ways. I'd love for example if someone made an enclosure acting also as multi port docking station so that old phones with unlocked bootloader (Fairphone being one of them) could be reflashed with a different operating system then used as mini PCs, media players, IoT wall terminals with bigger screens or other uses. Seeing all that perfectl…
It's certainly technically possible. Phone motherboards have limited wired IO, but USB host mode is enough for a lot of things. The problem is how locked-down most phones are, and how hard it is to modify their software. Even for the Fairphone, you have to fill out a form on their site to get a bootloader unlock code, and they could close that form if they wished (see Asus). That all means starting an "ecosystem" of…
You also need to sign up with Google to even get past the setup screen, and the phone needs to reach Google's servers and ask for permission to be used. Even if Fairphone would like to keep phones usable, Google can decide otherwise at any time.
I started a thread on this topic on their forums, and they seem to have no interest in fixing this. I wouldn't consider hardware sustainable if it needs to talk to Google's servers to be used and remains completely locked down otherwise. If you find one of these devices in a drawer in 15 years, and Google has changed their server's API, then the phone is as usable as any other brand
(nitpick: you have to "enter a contractual agreement" with Google, and not create an account. Folks on the forums seemed to be obsessed with the choice of word around this, although practically, it makes no difference).