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"Looking back through history, I see no evidence for humanity making the best of things, and I think it's a pretty safe bet that's an on-going trend."
- Richard Morgan

Pocket-Caller  
  Private communication device that fits in your pocket.  

Just because pocket-sized smartphones did not exist, you shouldn't assume that people didn't think about the features they might have.

His left hand reached into a side pocket, touched a flat oval device, smaller than his palm and pressed a stud. A mechanism began to purr. It was a pocket-caller, tuned to beams of certain other devices of the same sort.
From The Worlds of Tomorrow, by Manly Wade Wellman.
Published by Thrilling Wonder Stories in 1940
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