Tools/materials: iPhone 13, iOS 15. 1. 1, local settings.
1. Open the phone settings and click "General" to enter the general settings page.
2. Click "About this machine" to enter the page about the settings of this machine to view the serial number.
3. Open the website "checkcoverage.apple.com", enter the serial number page of Apple official website, and enter the serial number.
4. Click "Continue" to query the serial number in official website.