Saurabh discusses how smartphones can be used for more than just apps by adding additional hardware capabilities. He outlines several areas where smartphones combined with additional sensors and components could be used, including fitness devices, healthcare monitors, smart home devices, robotics, education, and more. Saurabh then discusses ways to start connecting external hardware to smartphones, such as through the audio jack, USB, Bluetooth, WiFi, or NFC, as well as using development platforms like IOIO, Android ADK, or Arduino. He encourages attendees to stay in touch by following his online profiles and pre-registering for upcoming workshops.