look up "Cell Broadcast"
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Not the same thing cell phones use but I like the spec for the alerting protocol used by weather radio and TV stations along with its DTMF translation: https://en.wikipedia.org/wiki/Specific_Area_Message_Encoding …
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It encodes events like "radiological hazard warning from the president" or "iceberg warning from the governor"
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It’s actually both in most implementations..
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