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A comment on Running the 1G Analog Phone from 1997.

Re:Running the 1G Analog Phone from 1997 by Animats on Tuesday July 06, 2021 @03:57AM (#27745331)
They're really simple to talk to. I think the control channel is just a 1200 baud modem.

SMS messages were originally intended as a way to send error messages (number out of service, etc.) to AMPS phones. Since they went over the control channel, they had to be very limited in length so as not to hog the shared control channel.

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Re:Running the 1G Analog Phone from 1997 by zikduruqe on Tuesday July 06, 2021 @02:24PM (#27752413)
Ah... brings back memories. I can still hear the handoff message.. bizzip.

I used to run an AMPS network back from 1991 to 1994. I miss the good old days; dailling NPA-NXX-7626 to reach a roamer, having to copy call records to magnetic tape to send off to GE for roaming calls, manually tuning combiners with my spectrum analyzer, calibrating audio levels on DS-0 cards using 1004 Hz tones, etc... it truly was a wireless telephone network.

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