From iOS 1 to iOS 9: How Apple's iPhone OS has Evolved
iOS 5 - Pre-packaged with the iPhone 4S, a week after the death of Steve Jobs, iOS 5 introduced Siri, Notification Center, iMessage, Reminders and Newsstand. Moreover, the addition of over 200 new features made iOS 5 the biggest iOS update Apple had released prior to that point. iOS 5 was also a big update for the operating system that included iCloud, iMessage, and deep social media integration.
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