Phone companies have, or are getting, out of the payphone business. Most of existing payphones are privately owned. The term COCOT stands for Customer Owned Coin Operated Telephone.
If you feel there is a demand for one in your area, buy your own and reap the riches.
www.payphone.com/Elcotel-Series-5.html
And what about public bathrooms?
FLL, put that out-house to work for you.