diff --git a/BaseSmsSender.php b/BaseSmsSender.php
new file mode 100644
index 0000000..7668170
--- /dev/null
+++ b/BaseSmsSender.php
@@ -0,0 +1,171 @@
+<?php
+
+namespace yetopen\smssender;
+
+use Yii;
+use yii\base\Component;
+use yii\base\Exception;
+use yii\log\Logger;
+
+/**
+ * BaseSmsSender serves as a base class that implements the basic functions required by [[SmsSenderInterface]].
+ *
+ * Concrete child classes should may focus on implementing the [[sendMessage()]] method.
+ */
+abstract class BaseSmsSender extends Component implements SmsSenderInterface
+{
+    /**
+     * @event SmsSenderEvent an event raised right before send.
+     * You may set [[SmsSenderEvent::isValid]] to be false to cancel the send.
+     */
+    const EVENT_BEFORE_SEND = 'beforeSend';
+    /**
+     * @event SmsSenderEvent an event raised right after send.
+     */
+    const EVENT_AFTER_SEND = 'afterSend';
+
+    /**
+     * @var array|string Recipients numbers.
+     */
+    public $numbers;
+    /**
+     * @var string The content of the message.
+     */
+    public $content;
+    /**
+     * @var string|null (optional) The sender name.
+     */
+    public $sender;
+    /**
+     * @var string (optional) International prefix (e.g. +39).
+     */
+    public $prefix;
+    /**
+     * @var string|null (optional) Date-time in which the message will be scheduled to be sent.
+     */
+    public $deliveryTime;
+
+    /**
+     * Create a new [SmsSenderInterface] instance
+     * @param array|string $numbers Recipient number.
+     * @param string $content Message to send.
+     * @param string|null $sender (optional) The sender name.
+     * @param string $prefix (optional) International prefix (e.g. +39).
+     * @param string|null $deliveryTime (optional) Date-time in which the message will be scheduled to be sent.
+     * @return string $response The response from the API.
+     */
+    public function createMessage($numbers, $content, $sender=NULL, $prefix="+39",$deliveryTime=NULL)
+    {
+        if(!is_array($numbers)) {
+            $numbers = [$numbers];
+        }
+        return new static([
+            'numbers' => $numbers,
+            'content' => $content,
+            'sender' => $sender,
+            'prefix' => $prefix,
+            'deliveryTime' => $deliveryTime,
+        ]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function send($tel, $message, $sender=NULL, $prefix="+39",$delivery_time=NULL)
+    {
+        $message = static::createMessage($tel, $message, $sender=NULL, $prefix="+39",$delivery_time=NULL);
+        if (!$this->beforeSend($message)) {
+            return false;
+        }
+        try {
+            $isSuccessful = $this->sendMessage($message);
+        } catch (Exception $exception) {
+            $isSuccessful = false;
+            Yii::error($exception, __METHOD__);
+        }
+        $this->afterSend($message, $isSuccessful);
+
+        return $isSuccessful;
+    }
+
+    /**
+     * Performs the actual sending of the SMS.
+     * @param $message BaseSmsSender
+     * @return bool
+     */
+    abstract public function sendMessage($message);
+
+    /**
+     * This method is invoked right before an sms is sent.
+     * You may override this method to do last-minute preparation for the message.
+     * If you override this method, please make sure you call the parent implementation first.
+     * @param BaseSmsSender $message
+     * @return bool whether to continue sending an email.
+     */
+    public function beforeSend($message)
+    {
+        $event = new SmsSenderEvent(['message' => $message]);
+        $this->trigger(self::EVENT_BEFORE_SEND, $event);
+
+        return $event->isValid;
+    }
+
+    /**
+     * This method is invoked right after an sms was send.
+     * You may override this method to do some postprocessing or logging based on sms send status.
+     * If you override this method, please make sure you call the parent implementation first.
+     * @param SmsSenderInterface $message
+     */
+    public function afterSend($message)
+    {
+        $event = new SmsSenderEvent(['message' => $message]);
+        $this->trigger(self::EVENT_AFTER_SEND, $event);
+    }
+
+    /**
+     * Logs an error message.
+     * An error message is typically logged when an unrecoverable error occurs
+     * during the execution of an application.
+     * @param string|array $message the message to be logged. This can be a simple string or a more
+     * complex data structure, such as array.
+     * @param string $category the category of the message.
+     */
+    protected function logError($message, $category)
+    {
+        $this->log(Logger::LEVEL_ERROR, $message, $category);
+    }
+
+    /**
+     * Logs a debug message.
+     * Trace messages are logged mainly for development purpose to see
+     * the execution work flow of some code. This method will only log
+     * a message when the application is in debug mode.
+     * @param string|array $message the message to be logged. This can be a simple string or a more
+     * complex data structure, such as array.
+     * @param string $category the category of the message.
+     */
+    protected function debug($message, $category)
+    {
+        // Logging only if `YII_DEBUG` is `true` since it's a Yii2 standard
+        if(YII_DEBUG) {
+            $this->log(Logger::LEVEL_TRACE, $message, $category);
+        }
+    }
+
+    /**
+     * If logging is enable it logs a message with the given type and category.
+     * @param string|array $message the message to be logged. This can be a simple string or a more
+     * complex data structure that will be handled by a [[Target|log target]].
+     * @param int $level the level of the message. This must be one of the following:
+     * `Logger::LEVEL_ERROR`, `Logger::LEVEL_WARNING`, `Logger::LEVEL_INFO`, `Logger::LEVEL_TRACE`,
+     * `Logger::LEVEL_PROFILE_BEGIN`, `Logger::LEVEL_PROFILE_END`.
+     * @param string $category the category of the message.
+     */
+    protected function log($level, $message, $category)
+    {
+        if(!$this->enableLogging) { // Logging is not enable, skipping
+            return;
+        }
+        Yii::getLogger()->log($message, $level, $category);
+    }
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..1c67a86
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,13 @@
+Yii2 SMS Sender Interface
+===========================
+
+0.1.1 17 Sep, 2021
+-------------------------
+
+- Adds BaseSmsSender class and SmsSenderEvent.
+- The base sender now triggers events before and after the sending of the message. 
+
+0.1.0 26 Aug, 2021
+-------------------------
+
+- Initial release.
\ No newline at end of file
diff --git a/SmsSenderEvent.php b/SmsSenderEvent.php
new file mode 100644
index 0000000..5a048ed
--- /dev/null
+++ b/SmsSenderEvent.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace yetopen\smssender;
+
+use yii\base\Event;
+
+/**
+ * SmsSenderEvent represents the event parameter used for events triggered by [[BaseSmsSender]].
+ *
+ * By setting the [[isValid]] property, one may control whether to continue running the action.
+ */
+class SmsSenderEvent extends Event
+{
+    /**
+     * @var SmsSenderInterface the mail message being send.
+     */
+    public $message;
+    /**
+     * @var bool if message was sent successfully.
+     */
+    public $isSuccessful;
+    /**
+     * @var bool whether to continue sending an email. Event handlers of
+     * [[\yii\mail\BaseSmsSender::EVENT_BEFORE_SEND]] may set this property to decide whether
+     * to continue send or not.
+     */
+    public $isValid = true;
+}
diff --git a/SmsSenderInterface.php b/SmsSenderInterface.php
index 9bb42e8..75c1dec 100755
--- a/SmsSenderInterface.php
+++ b/SmsSenderInterface.php
@@ -27,7 +27,7 @@ public function getMaxTextLength();
     /**
      * Send the message given the phone number and message.
      *
-     * @param array $number Recipient number.
+     * @param array|string $number Recipients phone numbers.
      *
      * @param string $message Message to send.
      *