code: func getMetadataForRegion(regionCode string) *PhoneMetadata {
  	if !isValidRegionCode(regionCode) {
  		return nil
  	}
  	val, _ := readFromRegionToMetadataMap(regionCode)
  	return val
  }
docs: // Returns the metadata for the given region code or nil if the region
  // code is invalid or unknown.