It took me a moment or so before I could remember this film - and then it came to me. At the time this film came out, I was 20 years old and living in a hotel on 44th Street, just off Broadway in New York City. Right around the corner, playing in a movie theater (located just below the then famous "Camels" smoking man display) was this film.
Outside they had hooked up a series of telephones near the lobby entrance, so that you could talk (pre-recorded) to a "Call Girl." The voice you heard was that of actress Anne Francis as the film's central character.
At the time I thought it was quite hokey and, at first, didn't spend my scarce funds on the film. But some days later a friend treated me to the film, and I was quite surprised and very impressed.
This was a damn good film for its time. The theme was hardly ever touched upon in films in those days. In fact, in most, at best hinted at briefly in the dialog.
This film, however, was well scripted and laid the subject bare with well written dialog. In my opinion, had it been produced some two or so decades later, Ms. Francic would have been deservedly nominated for an Academy Award.