Apple official website inspection process
Enter Apple's official website, find technical support, enter the page of "View Guarantee Service and Support Period", enter the serial number of the machine you want to inquire, and you can inquire.
Apple official website inspection entrance: https://checkcoverage.apple.com/
Enter the iPhone serial number for machine inspection: J3XXXXXXXXXX
The query is the above page before activation
After activation, you can check your own activation and guarantee time by querying
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First link: https://www.cnblogs.com/lingyejun/p/17567100.html