How to find an iPhone device UDID
- Connect your iPhone to your Mac.
- If you're asked to trust the device, tap Trust to grant it permission.
- Open the Finder app.
- In the Location section in the Finder sidebar, click the device to display its information.
- This will display the device page with details and options for the device.
- Click the details immediately below the device name to toggle different details about the device until you see the UDID.