Comment: I'm only guessing, but I

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I'm only guessing, but I

I'm only guessing, but I believe the alert would originate with a government agency, then it would be pushed to the service provider and they would in turn push the message out to users. If I find anything substantial that confirms or denies my assumptions, I'll post it.

UPDATE: OK, here are the details: http://www.fcc.gov/guides/commercial-mobile-alert-system-cmas

And: http://www.fcc.gov/guides/commercial-mobile-alert-system-cmas

You should be more concerned about GPS and cell tower based tracking and triangulation instead of an emergency alert system.