This presentation discusses building SMS-based applications with Ruby-SMPP. It notes that India has over 280 million mobile subscribers, the second largest mobile consumer base in the world. It argues that SMS is still a powerful communication tool, being asynchronous, supported on all devices, and enabled by innovations like T9 text. The presentation outlines the steps to build an SMS application, including deciding what to offer users and obtaining a phone number suitable for the intended use and messaging type.