Once upon a time, in order to make a phone call, you needed to talk to an operator. I was amazed to learn that in some parts of the U.S. there was no dial service until the 1970s.
This instructional film played in theaters, with no sound except for the usual silent film music, since it's 1927. It's hard to imagine what a technical undertaking it must have been, converting the phones in large cities—and what an adjustment for callers.
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