bonus question: how did this work when phone calls were still a relatively new thing?
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Phone calls convert your voice into a signal that travels at or very close to the speed of sound. With older phones it could be an electrical signal, and in the *really* early days your phone line went to a switchboard where an operator had to plug your phone line to the other line to connect you. These days all that’s automated, and with cell phones it’s radio waves to the towers, those can be converted to signals that travel through land lines and then they go back to radio signals to broadcast to the destination phone. And the speed of light is much, much faster than the speed of sound.
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