The 4′s operating system represents a significant improvement on earlier versions of ’s smartphone operating system. It’s also got a new name – iOS – signifying the importance of the alongside the iPhone. And what’s more, iOS 4 is available to users of the iPhone 3GS, third-gen iPod touch and 3G too (albeit with limited features with the latter).

5edf8c495800 200.jpg Tutorial: 20 iPhone tips for iPhone 4s

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Tutorial: 20 iPhone tips for iPhone 4s