fix special phone number format before the request to be able to perform external checks with valid content

Tests/ClientTest.php

@@ -205,7 +205,7 @@ class ClientTest extends ApiTestCase
             ->disableOriginalConstructor()
             ->getMock();
         $responseMock->expects($this->atLeastOnce())->method('getStatusCode')->willReturn($statusCode);
-        $responseMock->expects($okStatus ? $this->atLeastOnce() : $this->never())
+        $responseMock->expects($this->atLeastOnce())
             ->method('getBody')->willReturn($streamMock);
 
         /** @var GuzzleClient|MockObject $requestClientMock */

Tests/ValueObject/RecipientTest.php

@@ -78,7 +78,7 @@ class RecipientTest extends ApiTestCase
         $recipientMock->__construct($this->phoneNumberFixture, $this->phoneCountryFixture);
 
         $this->assertSame(
-            '491527565839',
+            '+491527565839',
             $this->callMethod(
                 $recipientMock,
                 'get'