public LookupHlr(long phonenumber, string reference, LookupHlrOptionalArguments optionalArguments = null)
            : base(phonenumber, reference)
        {
            optionalArguments = optionalArguments ?? new LookupHlrOptionalArguments();

            CountryCode = optionalArguments.CountryCode;
        }
        public LookupHlr(long phonenumber, LookupHlrOptionalArguments optionalArguments = null)
        {
            Msisdn = phonenumber;

            optionalArguments = optionalArguments ?? new LookupHlrOptionalArguments();

            CountryCode = optionalArguments.CountryCode;
        }