diff --git a/src/Application/Model/Configuration.php b/src/Application/Model/Configuration.php
index 9da0a7c..7b82141 100644
--- a/src/Application/Model/Configuration.php
+++ b/src/Application/Model/Configuration.php
@@ -25,7 +25,7 @@ class Configuration
      */
     public function getApiToken(): string
     {
-        $token = trim(Registry::getConfig()->getConfigParam('d3linkmobility_apitoken'));
+        $token = trim((string) Registry::getConfig()->getConfigParam('d3linkmobility_apitoken'));
 
         Assert::that($token)->string()->notEmpty();
 
diff --git a/src/Application/Model/MessageTypes/Sms.php b/src/Application/Model/MessageTypes/Sms.php
index acdb4a1..b928691 100644
--- a/src/Application/Model/MessageTypes/Sms.php
+++ b/src/Application/Model/MessageTypes/Sms.php
@@ -25,6 +25,7 @@ use D3\Linkmobility4OXID\Application\Model\UserRecipients;
 use D3\LinkmobilityClient\Exceptions\ApiException;
 use D3\LinkmobilityClient\Request\RequestInterface;
 use D3\LinkmobilityClient\SMS\SmsRequestInterface;
+use D3\LinkmobilityClient\ValueObject\Recipient;
 use D3\LinkmobilityClient\ValueObject\Sender;
 use Exception;
 use GuzzleHttp\Exception\GuzzleException;
diff --git a/tests/Application/Model/SmsTest.php b/tests/Application/Model/MessageTypes/SmsTest.php
similarity index 79%
rename from tests/Application/Model/SmsTest.php
rename to tests/Application/Model/MessageTypes/SmsTest.php
index 3c4c836..4a27f59 100644
--- a/tests/Application/Model/SmsTest.php
+++ b/tests/Application/Model/MessageTypes/SmsTest.php
@@ -13,11 +13,13 @@
 
 declare(strict_types=1);
 
-namespace D3\Linkmobility4OXID\Tests\Application\Model;
+namespace D3\Linkmobility4OXID\Tests\Application\Model\MessageTypes;
 
-use D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder;
-use D3\Linkmobility4OXID\Application\Model\Sms;
+use D3\Linkmobility4OXID\Application\Model\MessageTypes\Sms;
 use D3\ModCfg\Tests\unit\d3ModCfgUnitTestCase;
+use libphonenumber\PhoneNumberFormat;
+use libphonenumber\PhoneNumberType;
+use libphonenumber\PhoneNumberUtil;
 use OxidEsales\Eshop\Application\Model\Country;
 use OxidEsales\Eshop\Application\Model\Order;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -28,6 +30,7 @@ class SmsTest extends d3ModCfgUnitTestCase
     /** @var Sms */
     protected $model;
     protected $countryId = 'countryIdNo1';
+    protected $exampleNumber;
 
     public function setUp()
     {
@@ -41,6 +44,10 @@ class SmsTest extends d3ModCfgUnitTestCase
             'oxisoalpha2'   => 'DE'
         ]);
         $country->save();
+
+        $phoneUtil = PhoneNumberUtil::getInstance();
+        $example = $phoneUtil->getExampleNumberForType('DE', PhoneNumberType::MOBILE);
+        $this->exampleNumber = $phoneUtil->format($example,  PhoneNumberFormat::NATIONAL);
     }
 
     public function tearDown()
@@ -82,11 +89,10 @@ class SmsTest extends d3ModCfgUnitTestCase
 
         switch ($aArgs[0]) {
             case 'oxdelfon':
-                return '015792300219';
+            case 'oxbillfon':
+                return $this->exampleNumber;
             case 'oxdelcountryid':
                 return $this->countryId;
-            case 'oxbillfon':
-                return '015792300219';
         }
 
         $this->fail('Unknown variable '.$aArgs[0]);