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A common sight on the streets of Britain while I was growing up in the 1940s and 1950s were phones specifically for the use of police. They were in blue boxes, known as 'police boxes'.
The most noticeable ones looked just like Dr Who's Tardis. In fact making the Tardis look like a police box made a lot of sense back in the 1960s when Dr Who was first screened, because no-one thought it at all strange to come across a police box, and yet only the police, with their special key could get inside. (Members of the public could, though, reach the phone through a small door to get straight through to the police in an emergency.)
Not all police boxes were like the Tardis. Some were stands with a phone in a key-operated box, set at an easy-to-use height, as shown in the photo below.
If you can add anything to this page or provide a photo, I would be pleased to hear from you.