diff --git a/src/Entities/Enums/IsoCountries.php b/src/Entities/Enums/IsoCountries.php
index 1913376e..e621200e 100644
--- a/src/Entities/Enums/IsoCountries.php
+++ b/src/Entities/Enums/IsoCountries.php
@@ -164,6 +164,7 @@ class IsoCountries
         ["name" => "Nauru", "numeric" => "520", "alpha2" => "NR", "alpha3" => "NRU"],
         ["name" => "Nepal", "numeric" => "524", "alpha2" => "NP", "alpha3" => "NPL"],
         ["name" => "Netherlands", "numeric" => "528", "alpha2" => "NL", "alpha3" => "NLD"],
+        ["name" => "Netherlands Antilles", "numeric" => "530", "alpha2" => "AN", "alpha3" => "ANT"],
         ["name" => "New Caledonia", "numeric" => "540", "alpha2" => "NC", "alpha3" => "NCL"],
         ["name" => "New Zealand", "numeric" => "554", "alpha2" => "NZ", "alpha3" => "NZL"],
         ["name" => "Nicaragua", "numeric" => "558", "alpha2" => "NI", "alpha3" => "NIC"],
diff --git a/src/Gateways/Gp3DSProvider.php b/src/Gateways/Gp3DSProvider.php
index 4e2422cf..e6e0983f 100644
--- a/src/Gateways/Gp3DSProvider.php
+++ b/src/Gateways/Gp3DSProvider.php
@@ -15,6 +15,7 @@
 use GlobalPayments\Api\PaymentMethods\CreditCardData;
 use GlobalPayments\Api\PaymentMethods\RecurringPaymentMethod;
 use GlobalPayments\Api\Utils\GenerationUtils;
+use GlobalPayments\Api\Utils\StringUtils;
 
 class Gp3DSProvider extends RestGateway implements ISecure3dProvider
 {
@@ -239,15 +240,15 @@ public function processSecure3d(Secure3dBuilder $builder)
             // home phone
             if (!empty($builder->getHomeNumber())) {
                 $request['payer']['home_phone'] = [];
-                $request['payer']['home_phone'] = $this->maybeSetKey($request['payer']['home_phone'], 'country_code', $builder->getHomeCountryCode());
-                $request['payer']['home_phone'] = $this->maybeSetKey($request['payer']['home_phone'], 'subscriber_number', $builder->getHomeNumber());
+                $request['payer']['home_phone'] = $this->maybeSetKey($request['payer']['home_phone'], 'country_code', StringUtils::validateToNumber($builder->getHomeCountryCode()));
+                $request['payer']['home_phone'] = $this->maybeSetKey($request['payer']['home_phone'], 'subscriber_number', StringUtils::validateToNumber($builder->getHomeNumber()));
             }
 
             // work phone
             if (!empty($builder->getWorkNumber())) {
                 $request['payer']['work_phone'] = [];
-                $request['payer']['work_phone'] = $this->maybeSetKey($request['payer']['work_phone'], 'country_code', $builder->getWorkCountryCode());
-                $request['payer']['work_phone'] = $this->maybeSetKey($request['payer']['work_phone'], 'subscriber_number', $builder->getWorkNumber());
+                $request['payer']['work_phone'] = $this->maybeSetKey($request['payer']['work_phone'], 'country_code', StringUtils::validateToNumber($builder->getWorkCountryCode()));
+                $request['payer']['work_phone'] = $this->maybeSetKey($request['payer']['work_phone'], 'subscriber_number', StringUtils::validateToNumber($builder->getWorkNumber()));
             }
 
             // payer login data
@@ -291,8 +292,8 @@ public function processSecure3d(Secure3dBuilder $builder)
             // mobile phone
             if (!empty($builder->getMobileNumber())) {
                 $request['payer']['mobile_phone'] = [];
-                $request['payer']['mobile_phone'] = $this->maybeSetKey($request['payer']['mobile_phone'], 'country_code', $builder->getMobileCountryCode());
-                $request['payer']['mobile_phone'] = $this->maybeSetKey($request['payer']['mobile_phone'], 'subscriber_number', $builder->getMobileNumber());
+                $request['payer']['mobile_phone'] = $this->maybeSetKey($request['payer']['mobile_phone'], 'country_code', StringUtils::validateToNumber($builder->getMobileCountryCode()));
+                $request['payer']['mobile_phone'] = $this->maybeSetKey($request['payer']['mobile_phone'], 'subscriber_number', StringUtils::validateToNumber($builder->getMobileNumber()));
             }
 
             // browser_data
diff --git a/src/Utils/StringUtils.php b/src/Utils/StringUtils.php
index 801c77ed..2a840f3f 100644
--- a/src/Utils/StringUtils.php
+++ b/src/Utils/StringUtils.php
@@ -73,4 +73,16 @@ public static function toAmount($str)
 
         return $str / 100;
     }
+
+    /**
+     * Strip all non-numeric characters
+     *
+     * @param string $value
+     *
+     * @return mixed
+     */
+    public static function validateToNumber($value)
+    {
+        return preg_replace("/[^0-9]/", "", $value);
+    }
 }
diff --git a/test/Integration/Gateways/RealexConnector/HppTest.php b/test/Integration/Gateways/RealexConnector/HppTest.php
index f11f199b..fe0f39fb 100644
--- a/test/Integration/Gateways/RealexConnector/HppTest.php
+++ b/test/Integration/Gateways/RealexConnector/HppTest.php
@@ -757,4 +757,42 @@ public function testSupplementaryDataWithTwoValuesSerialized()
         $expectedJson = '{"MERCHANT_ID":"MerchantId","ACCOUNT":"internet","ORDER_ID":"GTI5Yxb0SumL_TkDMCAxQA","AMOUNT":"1999","CURRENCY":"EUR","TIMESTAMP":"20170725154824","AUTO_SETTLE_FLAG":"1","COMMENT1":"Mobile Channel","CUST_NUM":"a028774f-beff-47bc-bd6e-ed7e04f5d758a028774f-btefa","OFFER_SAVE_CARD":"1","PAYER_EXIST":"0","PROD_ID":"a0b38df5-b23c-4d82-88fe-2e9c47438972-b23c-4d82-88f","VAR_REF":"My Legal Entity","HPP_LANG":"GB","MERCHANT_RESPONSE_URL":"https:\/\/www.example.com\/response","HPP_VERSION":"2","RANDOM_KEY1":"VALUE_1","RANDOM_KEY2":"VALUE_2","SHA1HASH":"7116c49826367c6513efdc0cc81e243b8095d78f"}';
         $this->assertEquals($json, $expectedJson);
     }
+
+    public function testNetherlandsAntillesCountry()
+    {
+        $config = new GpEcomConfig();
+        $config->merchantId = "MerchantId";
+        $config->accountId = "internet";
+        $config->sharedSecret = "secret";
+        $config->serviceUrl = "https://pay.sandbox.realexpayments.com/pay";
+
+        $config->hostedPaymentConfig = new HostedPaymentConfig();
+        $config->hostedPaymentConfig->language = "GB";
+        $config->hostedPaymentConfig->responseUrl = "https://www.example.com/response";
+        $config->hostedPaymentConfig->version = HppVersion::VERSION_2;
+        $config->gatewayProvider = GatewayProvider::GP_ECOM;
+
+        $service = new HostedService($config);
+
+        // billing address
+        $billingAddress = new Address();
+        $billingAddress->streetAddress1 = 'Flat 123';
+        $billingAddress->streetAddress2 = 'House 456';
+        $billingAddress->postalCode = "50001";
+        $billingAddress->country = "AN";
+
+        $hostedPaymentData = new HostedPaymentData();
+        $hostedPaymentData->customerNumber = 'a028774f-beff-47bc-bd6e-ed7e04f5d758a028774f-btefa';
+        $hostedPaymentData->productId = 'a0b38df5-b23c-4d82-88fe-2e9c47438972-b23c-4d82-88f';
+
+        $json = $service->charge(19.99)
+            ->withCurrency("EUR")
+            ->withHostedPaymentData($hostedPaymentData)
+            ->withAddress($billingAddress, AddressType::BILLING)
+            ->serialize();
+
+        $response = json_decode($json, true);
+        $this->assertEquals('AN', $response['BILLING_CO']);
+        $this->assertEquals('530', $response['HPP_BILLING_COUNTRY']);
+    }
 }
diff --git a/test/Integration/Gateways/RealexConnector/Secure3dServiceTests.php b/test/Integration/Gateways/RealexConnector/Secure3dServiceTests.php
index 1d2c93f2..7a5245ff 100644
--- a/test/Integration/Gateways/RealexConnector/Secure3dServiceTests.php
+++ b/test/Integration/Gateways/RealexConnector/Secure3dServiceTests.php
@@ -177,6 +177,9 @@ public function testFullCycle_v2()
                 ->withBrowserData($this->browserData)
                 ->withMethodUrlCompletion(MethodUrlCompletion::NO)
                 ->withChallengeRequestIndicator(ChallengeRequestIndicator::NO_PREFERENCE)
+                ->withMobileNumber('+44','11 33 44 44')
+                ->withHomeNumber('44', '12444555')
+                ->withWorkNumber('+44','345 6667')
                 ->execute();
             $this->assertNotNull($initAuth);