isCarrierSpecificForRegion method

bool isCarrierSpecificForRegion(PhoneNumber number, String regionDialingFrom)

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.

number the valid short number to check regionDialingFrom the region from which the number is dialed returns whether the short number is carrier-specific in the provided region, assuming the input was a valid short number

Implementation

bool isCarrierSpecificForRegion(
    PhoneNumber number, String regionDialingFrom) {
  if (!_regionDialingFromMatchesNumber(number, regionDialingFrom)) {
    return false;
  }
  String nationalNumber = _getNationalSignificantNumber(number);
  PhoneMetadata? phoneMetadata =
      _getShortNumberMetadataForRegion(regionDialingFrom);
  return (phoneMetadata != null) &&
      (_matchesPossibleNumberAndNationalNumber(
          nationalNumber, phoneMetadata.carrierSpecific));
}