PrankGPT is an AI tool that allows users to play pranks on others by making prank calls. It requires entering the phone number of the person to be pranked and selecting a voice from the available options. Additionally, users can provide a prompt to guide the AI in the conversation. PrankGPT is built using the Vocode open source library and offers voices provided by Rime Labs and Google Cloud. This tool can be used for various prank scenarios, offering different voice options and customizable prompts to make the prank more convincing and entertaining.