Fixing Xcode 9 Issue: “iPhone is Busy: Preparing Debugger Support for iPhone”

Fixing Xcode 9 Issue: "iPhone is Busy: Preparing Debugger Support for iPhone"

6 June 2024 Stephan Petzl Leave a comment Tech-Help

If you’re encountering the message “iPhone is busy: Preparing debugger support for iPhone” while using Xcode 9, it can be frustrating. This guide provides several solutions to help you quickly resolve this issue.

Understanding the Issue

When connecting an iPhone updated to iOS 11, Xcode 9 might display the message indicating it’s preparing debugger support for the device. This process can sometimes take longer than expected, causing delays in your development workflow.

Solutions to Resolve the Issue

  1. Patiently Wait: Often, the process will complete on its own within 10 to 15 minutes. Use this time to take a short break.
  2. Restart Devices: Disconnect your iPhone, restart both the iPhone and Xcode, and then reconnect the device.
  3. Use Devices and Simulators:
    • Open Window > Devices and Simulators (Shortcut: Cmd+Shift+2).
    • Select your connected iPhone, which should display the message “iPhone is busy: Preparing debugger support for iPhone”.
    • Click the + button at the bottom-left corner.
    • Follow the prompts to complete the device setup. Click Next and then Done once the setup is successful.
  4. Unpair and Re-pair Device:
    • Unpair your iPhone from Xcode.
    • Disconnect and reconnect the USB cable.
    • Pair the iPhone again, ensuring you select Trust on your iPhone and enter your passcode when prompted.

Additional Tips

If the above solutions do not work, consider the following additional tips:

  • Ensure iTunes is not interfering by disconnecting your phone through iTunes first.
  • Free up disk space on your Mac to accommodate the debugger support files.
  • Check that your Xcode version is fully compatible with the iOS version on your device.


By following these steps, you should be able to resolve the “iPhone is busy: Preparing debugger support for iPhone” issue in Xcode 9. If you encounter persistent problems, ensure your software versions are up to date and that your development environment is properly configured.

Enhancing Your Mobile Development Workflow

For mobile developers looking to streamline their testing processes, consider using Repeato, a no-code test automation tool for iOS and Android. Repeato leverages computer vision and AI to create, run, and maintain automated tests quickly and efficiently. This allows developers to focus on creating high-quality apps while enabling non-technical colleagues to handle test automation tasks. Learn more about how Repeato can enhance your development workflow on our blog.

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