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Which still lives on today in cellular networks. At least up to LTE, I haven't looked lately to see if they're sticking around for 5G.

https://www.rfwireless-world.com/Terminology/modem-AT-comman...

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If you are talking to one of those self-contained, postage stamp-sized GSM modules using a microcontroller, chances are there'll be a serial link to it, and it's listening to Hayes commands.

It's still there.

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