Damn this needs building for the UK payphones there are a dying breed too and they used to be everywhere
In Germany some of the booths were converted into public libraries, those that people use to freely exchange books.
They are rare, but I have already spot some in the wild.
We actually ran something similar in the UK a couple of years ago but had to shut it down due high costs.
However we recently figured out how to do it in a way that won't bankrupt us, so keep your eyes peeled over the next few weeks...
https://payphone.team