Apple debuts iOS 9: Battery enhancements, smarter Siri and more

Apple just revealed the latest version of iOS at its Worldwide Developers Conference.

iOS 9, which will roll out to iPhones and iPads later this year, adds a suite of new features to the operating system

With a smarter Siri, battery enhancements and other performance improvements, iOS 9 is expected to bring more subtle changes to iOS, compared with iOS 8, which was the biggest overhaul of Apple's mobile operating system yet.

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