In this article, Devin Rader explains how to build a simple group messaging application using ASP.NET MVC and Twilio. The application allows users to join a group by sending the command "START" to a specified phone number, and then forwards any messages sent to that number to all other members in the group. The application uses Entity Framework 6 for data storage and includes features such as member subscription and message forwarding. Devin provides step-by-step instructions on how to set up the application using Visual Studio 2013, .NET 4.5, ASP.NET MVC 5, and EntityFramework 6, as well as the Twilio .NET Helper Library. The article concludes by highlighting potential extensions to the application, such as requiring a PIN for joining, allowing members to set display names, and handling messages longer than 140 characters.