How to run a diagnostics on an iPhone?
How do I run a dyanostics test on iPhone 6
[Re-Titled by Moderator]
iPhone 6s, iOS 15
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It's not part of iOS. If you want to measure Benchmarks (Performance, Graphics test, etc.) there are apps in the App Store that can do it. If this is because you have problems with your iPhone, then you must return it to an Authorized Apple Service Center.
See more here:
iPhone Repair - Official Apple Support
