### Answer
I'm sorry to hear you're experiencing issues with choppy audio and unexpected hang-ups while using Vapi in your React Native Expo app. The specific problems you're encountering with audio quality and call behavior are not directly addressed within the information sources available to me.
However, it's essential to ensure that the SDK and your application are configured correctly and that you're using compatible versions of any libraries or dependencies involved. Ensuring optimal performance in environments like the iOS simulator can sometimes require specific settings or considerations.
While I can't provide a direct solution based on the provided information, I recommend reviewing the Vapi documentation and ensuring that your setup aligns with the recommended practices and configurations. Exploring the React Native SDK documentation could provide insights or configurations specific to handling audio and calls more reliably [(1)](
) .
For more complex issues or if the problem persists, it might be beneficial to look for any known issues on the GitHub repository or reach out to the community for insights. They might have encountered similar challenges and could offer solutions or workarounds.