From Longman Dictionary of Contemporary Englishpay phoneˈpay phone noun [countable] TCTa public telephone that you can use when you put in a coin or a credit card
Examples from the Corpus
pay phone• Radio journalists learned to carry lots of change because a pay phone was a necessity when a story was breaking.• The closest one she can find is a pay phone just outside Mac Court.• There was a pay phone on the wall next to the hall stand.• It wasn't permitted to take incoming calls on the pay phone in the hallway of the hotel.• When Lucy came out, Josie was on the pay phone at the corridor's end. 