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"If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction."
- Frederik Pohl

Portable Telephone  
  The essence of a cell phone.  

Matt Dodson is walking with a friend.

"Say, your telephone is sounding."

"Oh!" Matt fumbled in his pouch and got out his phone.

"Hello?"

"That you, son?" came his father's voice.

From Space Cadet, by Robert Heinlein.
Published by Scribner's Sons in 1948
Additional resources -

Another interesting feature of this passage is that it is the friend who hears the cell phone, not the owner of the phone. How many times have you had to point out to someone that their phone was going off?

Heinlein fans should also note the "pommel phone" in his excellent 1951 novel Between Planets:

A few hundred yards further on Lazy [the horse] shied again, not from a snake this time but from an unexpected noise. Don pulled him in and spoke severely. "You bird-brained butterball! When are you going to learn not to jump when the telephone rings?"

Lazy twitched his shoulder muscles and snorted. Don reached for the pommel, removed the phone, and answered. "Mobile 6-J-233309, Don Harvey speaking."

See also the pocketphone from Heinlein's 1953 novel Assignment in Eternity. In this novel, he coins a better name.

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Additional resources:
  More Ideas and Technology from Space Cadet
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Space Cadet
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