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It could talk to a ship in orbit with no infrastructure.
No infrastructure? What about that huge ship they had, with receiver and sending arrays? We can also talk to people on the other side of the planet using satelite
It could talk without speed-of-light delay (it was a subspace radio.)
Hmm, no. They couldn't use their communicator beyond a certain range (mostly ship/planet)
It could be heard and let you hear over loud background noise and make voices distinguishable in a crowd (phased acoustic arrays?)
You've never made a phonecall in a busy environment?
It could run for days or weeks on a charge. (or months, depending on the needs of the script)
I can use my phone for weeks on a charge. As long as I don't turn on that huge screen (which that communicator device didn't have). The communicators of the later series were more amazing, in that respect. They must have one of those flat batteries! (no idea what they're called in English).
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