I think it would be an interesting addition to your website to have live video feeds of actual payphones. One could then call a pay telephone and watch who answers. It would make it much more fun and interesting.
There is a payphone on a webcam on Chester Road, Sunderland, UK, outside Sunderland University. Does anyone have the number for it? Click here to see it http://157.228.32.59/java.htm Please post the number here if you have it or can get it.