I think the main goal here is that people using the phone don't have to pay for it. To that point though, it may be cheaper to use an existing (maybe thrown awa

I think the main goal here is that people using the phone don't have to pay for it. To that point though, it may be cheaper to use an existing (maybe thrown away) phone and just install it in a phone booth, then have an unlimited calling service set up so it's free for anyone on the street to use