Runs on phones or in the browser because it is a Progressive Web Application and it is totally free.
Under 100 lines of plain JS code creates a voice bot using ChatGPT API .
For more information visit the github, navigate to the demo, and then enter in your API key which is stored in the browser cache (press Submit, click, or tap the screen to see the API key dialog):
https://github.com/jay23606/chat-gpt-voice