Payphones actually cost money.

Most people have a cellphone and don't use payphones much any more.

Payphones are disappearing at a pretty rapid clip. Phone companies are outsourcing their payphones to third parties that contact businesses with payphones on their property and give businesses the option to pay to keep the payphone or the third party comes and removes it. Most businesses don't want to pay to provide payphones and elect to have them removed.

So what's the next payphone? If they don't figure out how to improve battery life on mobile devices, it could very well be a per minute rapid charging station.