The IBM Watson Message Insights Add-On from Twilio enables the detection of language in text messages, allowing businesses to route customer support requests to agents who speak their native language. To leverage this feature, developers can combine it with Twilio's Programmable SMS and TaskRouter services using ASP.NET and C#. By installing the Message Insights Add-On, sending inbound SMS messages through a Twilio account, and routing them to workers based on their language skills, businesses can provide more effective customer support while reducing costs. The process involves creating a simple web application that receives an inbound SMS message, uses Message Insights to determine the language of the message text, and routes it to an appropriate worker using TaskRouter. With this integration, developers can create more efficient and personalized customer support experiences.