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Steps
- Connect the iPhone to an USB port of your macOS device.
- If the iPhone asks for permission to trust the macOS device, grant it (assuming it’s a device you trust).
- Open the Finder app.
- Go to the iPhone in the Locations section of the sidebar. It should open the device’s page.
- Click on the info section bellow the iPhone name on the top of the page until it displays the UDID.