Pre-installed files
How does trusted certificate store works on iOS devices.
iPhone 7, iOS 15
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Trust Stores contains trusted root certificates that are preinstalled with iOS. You can read more about Available trusted root certificates for Apple operating systems - Apple Support and see a List of available trusted root certificates in iOS 15.1, iPadOS 15.1, macOS 12.1, tvOS 15.1, and watchOS 8.1 - Apple Support. Let us know if you have more specific questions and enjoy the rest of your day!