iChatWithGPT is a service that allows you to use ChatGPT, an AI chatbot powered by OpenAI, on your iPhone or Watch through iMessage. You can ask ChatGPT questions, get ideas, or have fun conversations with it. You can also share the benefits of AI with your family and friends by introducing them to Olly, the name of the chatbot. You can sign up for a free invite and access ChatGPT without any signup or identifying information. You can also use their web application to save and organize your past conversations.