code: def _is_nanpa_number_with_national_prefix(self):
          
          # For NANPA numbers beginning with 1[2-9], treat the 1 as the national
          # prefix. The reason is that national significant numbers in NANPA
          # always start with [2-9] after the national prefix.  Numbers
          # beginning with 1[01] can only be short/emergency numbers, which
          # don't need the national prefix.
          return (self._current_metadata.country_code == 1 and self._national_number[0] == '1' and
                  self._national_number[1] != '0' and self._national_number[1] != '1')
docs: Returns true if the current country is a NANPA country and the
          national number begins with the national prefix.