In this article, the author demonstrates how to build a bulk SMS sender using Twilio, PHP, and Yii2. The application allows users to send customized SMS notifications in bulk to clients via Twilio's SMS API. To create the application, the author follows several steps, including installing required dependencies, setting up the database, creating models and controllers, and implementing the logic for sending bulk notifications. The codebase is made available on GitHub for further exploration. The article concludes by highlighting the benefits of using Twilio for sending bulk SMS notifications, including its ability to handle queuing and delivery in real-time.