code: def is_carrier_specific_for_region(numobj, region_dialing_from):
      
      if not _region_dialing_from_matches_number(numobj, region_dialing_from):
          return False
      national_number = national_significant_number(numobj)
      metadata = PhoneMetadata.short_metadata_for_region(region_dialing_from)
      return (metadata is not None and
              _matches_possible_number_and_national_number(national_number, metadata.carrier_specific))
docs: Given a valid short number, determines whether it is carrier-specific when
      dialed from the given region (however, nothing is implied about its
      validity). Carrier-specific numbers may connect to a different end-point,
      or not connect at all, depending on the user's carrier. If it is important
      that the number is valid, then its validity must first be checked using
      isValidShortNumber or isValidShortNumberForRegion. Returns false if the
      number doesn't match the region provided.
  
      Arguments:
      numobj -- the valid short number to check
      region_dialing_from -- the region from which the number is dialed
  
      Returns whether the short number is carrier-specific, assuming the input
      was a valid short number.