Review: Apple makes all the right calls on iPhone 4

The iPhone has had an enormous impact in the three years since Apple's original smartphone exploded onto the scene. Its fancy touch-screen established that a physical keypad or keyboard were no longer de rigueur for cellphones. Its dazzling browser proved you don't have to compromise the way you experience the Web on a mobile device. And the App Store popularized third-party add-on programs on a handheld computer, to the tune of more than 225,000 apps and more than 5 billion downloads.

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