ONE800 is a smart AI tool that allows users to access ChatGPT and generate AI content directly from iMessage. It offers a collection of AI tools like ChatGPT and Midjourney, all conveniently accessible within iMessage without the need for download. Users can chat with their favorite celebrities and idols, get instant expert answers, receive helpful advice on various topics, and even unleash their artistic creativity. ONE800 is free to try and provides a seamless and hassle-free experience.