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iOS 5 - Wikipedia
About iOS 5 - Apple Support
iOS 5 - Apple Wiki
iOS 5 Manuals and Downloads - Apple Support
Apple Launches iPhone 4S, iOS 5 & iCloud
iOS 5 Review: Ambitious update rings in the changes
How to upgrade your iOS device to iOS 5 - Macworld
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The complete guide to iOS 5 - CNET
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