Here is a neutral and interesting summary of the provided text in one paragraph: Twilio's Programmable SMS guide provides detailed documentation on how to track SMS conversations, use delivery status to confirm message delivery, retrieve and modify message history, and more. The guide offers code snippets in various programming languages, including PHP, C#, Java, Python, Ruby, and JavaScript, making it easier for developers to build Twilio apps that can handle complex SMS interactions and edge cases, such as tracking conversations with cookies and delivering receipts when replying to messages. With the Programmable SMS guide, developers can level up their Twilio game and build features faster, and get feedback from Twilio through various APIs to continually improve their service.