US telephone prefix locator
Russell McMahon email (remove spam text)
Maybe USA'ites have a better way of doing this but from down here this is
the best method I could find.
http://www.piclist.com hint: The PICList is archived three different
ways. See http://www.piclist.com/#archives for details.
See also: www.piclist.com/techref/pots/dtmf.htm?key=telephone
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