Utilizing the iOS Shortcuts app and an OpenAI API key, users can integrate ChatGPT directly onto their iPhones to function as an advanced AI assistant. The process involves generating a secret key from OpenAI, downloading a shortcut template, and enabling access through voice commands, back-taps, or widgets. For a complete guide, search for "2022 How-to-Use-ChatGPT-on-Your-iPhone-With-One-iOS-Shortcut" on sites like RoutineHub.