diff --git a/src/Application/Controller/Admin/AdminOrder.php b/src/Application/Controller/Admin/AdminOrder.php
index ed79a99..6117bb0 100644
--- a/src/Application/Controller/Admin/AdminOrder.php
+++ b/src/Application/Controller/Admin/AdminOrder.php
@@ -92,7 +92,12 @@ class AdminOrder extends AdminController
                     oxNew(successfullySentException::class, $sms->getResponse()->getSmsCount() )
                 );
             } else {
-                Registry::getUtilsView()->addErrorToDisplay( Registry::getLang()->translateString( 'D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND' ) );
+                Registry::getUtilsView()->addErrorToDisplay(
+                    sprintf(
+                        Registry::getLang()->translateString( 'D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND' ),
+                        $sms->getResponse()->getErrorMessage()
+                    )
+                );
             }
         } catch (noRecipientFoundException $e) {
             Registry::getUtilsView()->addErrorToDisplay($e);
diff --git a/src/Application/Controller/Admin/AdminUser.php b/src/Application/Controller/Admin/AdminUser.php
index deb1ed8..bc33d5f 100644
--- a/src/Application/Controller/Admin/AdminUser.php
+++ b/src/Application/Controller/Admin/AdminUser.php
@@ -94,7 +94,10 @@ class AdminUser extends AdminController
             );
         } else {
             Registry::getUtilsView()->addErrorToDisplay(
-                Registry::getLang()->translateString('D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND')
+                sprintf(
+                    Registry::getLang()->translateString( 'D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND' ),
+                    $sms->getResponse()->getErrorMessage()
+                )
             );
         }
     }
diff --git a/src/Application/Model/Sms.php b/src/Application/Model/Sms.php
index 4129d78..9308481 100644
--- a/src/Application/Model/Sms.php
+++ b/src/Application/Model/Sms.php
@@ -21,6 +21,7 @@ use D3\Linkmobility4OXID\Application\Model\RequestFactory;
 use D3\LinkmobilityClient\Exceptions\ApiException;
 use D3\LinkmobilityClient\Request\RequestInterface;
 use D3\LinkmobilityClient\Response\ResponseInterface;
+use D3\LinkmobilityClient\SMS\SmsRequestInterface;
 use D3\LinkmobilityClient\ValueObject\Recipient;
 use D3\LinkmobilityClient\ValueObject\Sender;
 use GuzzleHttp\Exception\GuzzleException;
@@ -99,8 +100,17 @@ class Sms
             $configuration = oxNew( Configuration::class );
             $client        = oxNew( MessageClient::class )->getClient();
 
+            /** @var SmsRequestInterface $request */
             $request = oxNew( RequestFactory::class, $this->getMessage(), $client )->getSmsRequest();
-            $request->setTestMode( $configuration->getTestMode() )->setMethod( RequestInterface::METHOD_POST )->setSenderAddress( oxNew( Sender::class, $configuration->getSmsSenderNumber(), $configuration->getSmsSenderCountry() ) )->setSenderAddressType( RequestInterface::SENDERADDRESSTYPE_INTERNATIONAL );
+            $request->setTestMode( $configuration->getTestMode() )->setMethod( RequestInterface::METHOD_POST )
+                ->setSenderAddress(
+                    oxNew(
+                        Sender::class,
+                        $configuration->getSmsSenderNumber(),
+                        $configuration->getSmsSenderCountry()
+                    )
+                )
+                ->setSenderAddressType( RequestInterface::SENDERADDRESSTYPE_INTERNATIONAL );
 
             $recipientsList = $request->getRecipientsList();
             foreach ($recipientsArray as $recipient) {
@@ -111,6 +121,10 @@ class Sms
 
             $this->response = $response;
 
+            if (false === $response->isSuccessful()) {
+                Registry::getLogger()->warning( $response->getErrorMessage(), [$request->getBody()] );
+            }
+
             return $response->isSuccessful();
         } catch (abortSendingExceptionInterface $e) {
             Registry::getLogger()->warning($e->getMessage());
diff --git a/src/Application/views/admin/de/d3Linkmobility_lang.php b/src/Application/views/admin/de/d3Linkmobility_lang.php
index ac06b59..685c974 100644
--- a/src/Application/views/admin/de/d3Linkmobility_lang.php
+++ b/src/Application/views/admin/de/d3Linkmobility_lang.php
@@ -30,7 +30,7 @@ $aLang = [
 
     'SHOP_MODULE_GROUP_d3linkmobility_sms'              => 'SMS-Versand',
     'SHOP_MODULE_d3linkmobility_smsSenderNumber'        => 'Sendernummer',
-    'HELP_SHOP_MODULE_d3linkmobility_smsSenderNumber'   => 'Ihre Mobilfunknummer, die als Antwortziel verwendet werden kann.',
+    'HELP_SHOP_MODULE_d3linkmobility_smsSenderNumber'   => 'Ihre Mobilfunknummer, die als Antwortziel verwendet werden kann., Bitte lassen Sie die gewünschte Telefonnummer in Ihrem Konto hinterlegen.',
     'SHOP_MODULE_d3linkmobility_smsSenderCountry'       => 'Landeskürzel',
     'HELP_SHOP_MODULE_d3linkmobility_smsSenderCountry'  => 'Geben Sie hier das Landeskürzel (ISO-Alpha-2, z.B. DE, AT, FR) an, zu dem Ihre Mobilfunknummer zugeordnet ist.',
     'SHOP_MODULE_d3linkmobility_smsUserRecipientsFields'=> 'Felder des Benutzerkontos, die auf gültige Mobilfunknummern geprüft werden',
@@ -52,7 +52,7 @@ $aLang = [
 
     'D3LM_EXC_MESSAGE_NO_LENGTH'                        => 'Die Mitteilung muss Inhalt haben',
     'D3LM_EXC_SMS_SUCC_SENT'                            => 'Die Mitteilung wurde erfolgreich versendet. (%1$s Nachricht(en) verwendet)',
-    'D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND'              => 'Beim Versenden der Nachricht(en) ist ein unerwarteter Fehler aufgetreten.',
+    'D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND'              => 'Beim Versenden der Nachricht(en) ist dieser Fehler aufgetreten: %1$s',
     'D3LM_EXC_NO_RECIPIENT_SET'                         => 'Kein (verwendbarer) Empfänger gesetzt.',
 
     'D3LM_REMARK_SMS'                                   => 'SMS-Nachr.',