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Call Sign DigitThis digit is always a single numeral, 0 (zero) through 9 which usually indicates a geographical area within the continental (lower 48 contiguous) United States. For initially issued call signs, the mailing address of the licensee determines the numeral. Area digits (also between 0 and 9) of ham stations outside of the contiguous U.S. are arbitrarily assigned by the FCC. For example the area digit for American Samoa is the number 8.