+442072785424, O/S St Pancras Station, Euston Road, London, NW1 2QP, United Kingdom
Great phone box that does get a good amount photographing by tourists in this very touristy area.
Although the payphone looks wonderful from the outside and adds very much to the area as well as the hotel (St. Pancras Renaissance Hotel London) which benefits from it behind, the payphone stinks inside from the usual urine. There's also a number of prostitution calling cards tacked up within the phone box.
The box does ring when called but due to the busy road it is hard to hear from outside. But you may catch a tourist opening the door.