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"Everything starts as somebody's daydream. And, when you're daydreaming, it is science fiction. It's when you start work out how you put it together, true science fiction becomes real science."
- Larry Niven

Ultrophone  
  A means of communication that transmits and receives simultaneously.  

Not for them the old-fashioned radios, and other devices which, as marvelous as they are, must use plodding electromagnetic radiation to carry the message.

Other members of the air patrol would send up rockets on seeing hers, until finally a scout equipped with an ultrophone, which, unlike the ancient radio, operated on the ultronic ethereal vibrations, would pass the warning simultaneously to the headquarters of the Wyoming Gang and other communities within a radius of several hundred miles. This would also alert the few American rocketships that might be in the air, which instantly would duck to cover either through forest clearings or by flattening down to earth in green fields where their coloring would probably protect them from observation.
From Armageddon: 2419 A.D., by Philip Frances Nowlan.
Published by Amazing Stories in 1928
Additional resources -

I can't think of an earlier reference to the idea of FTL communication in science fiction.

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Additional resources:
  More Ideas and Technology from Armageddon: 2419 A.D.
  More Ideas and Technology by Philip Frances Nowlan
  Tech news articles related to Armageddon: 2419 A.D.
  Tech news articles related to works by Philip Frances Nowlan

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