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Determining someone's place of origin by checking out their cell phone number's area code. Even if they move cross country, people often keep their cell phone numbers to avoid losing contact with friends, or, simply because it's convenient.

Interpreting their retained area code gives a ready glimpse into the history of the person.
Dude1: That girl is hot! Is she from around here?
Dude2: Her cell phone number starts with 619. Area code DNA tells me she's from San Diego.
by Big Griff August 24, 2010