The payphone was a touch tone and was located on the left of the "Restrooms" door in the pilot episode. For the first season, it was moved to the right of the doors that led to the kitchen section of the diner. For the second season, it was moved to the wall between the two doors that became two separate restrooms and was replaced by a phone with a rotary dial. From 1978 to 1985, the phone was a touch tone and was located at a section that was a few steps away from the entrance to the diner.