United States Phone Number and Area Code Information.
CheckThem provides the most comprehensive search statistics and results for telephone numbers in United States.
The formats of the phone numbers are always NPA-NXX-XXXX:

NPA = Area code assigned to a Numbering Plan Area
NXX = Prefix or „exchange“ assigned to a central office
XXXX = Local number or „subscriber number“

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Източник: Phone directory

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