public void TestIsCarrierSpecific()
        {
            var carrierSpecificNumber = new PhoneNumber.Builder().SetCountryCode(1).SetNationalNumber(33669L).Build();

            Assert.True(ShortInfo.IsCarrierSpecific(carrierSpecificNumber));
            Assert.True(
                ShortInfo.IsCarrierSpecificForRegion(Parse("33669", RegionCode.US), RegionCode.US));

            var notCarrierSpecificNumber = new PhoneNumber.Builder().SetCountryCode(1).SetNationalNumber(911L).Build();

            Assert.False(ShortInfo.IsCarrierSpecific(notCarrierSpecificNumber));
            Assert.False(
                ShortInfo.IsCarrierSpecificForRegion(Parse("911", RegionCode.US), RegionCode.US));

            var carrierSpecificNumberForSomeRegion =
                new PhoneNumber.Builder().SetCountryCode(1).SetNationalNumber(211L).Build();

            Assert.True(ShortInfo.IsCarrierSpecific(carrierSpecificNumberForSomeRegion));
            Assert.True(
                ShortInfo.IsCarrierSpecificForRegion(carrierSpecificNumberForSomeRegion, RegionCode.US));
            Assert.False(
                ShortInfo.IsCarrierSpecificForRegion(carrierSpecificNumberForSomeRegion, RegionCode.BB));
        }