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How to manage app permissions on your iPhone
Check the permissions you’ve allowed your iPhone apps.
These permissions cover some pretty fundamental parts of iOS, including access to the iPhone camera, microphone, and current location. But sometimes, especially when you’re in a hurry, it’s easy to accidentally give permission for an app to access data it doesn’t really require. Reading through this list before you do any downloading or installing can give you a good idea of how much access to your iPhone and data an app wants.
Or read this on The Verge