The <a href="http://www.pcworld.com/article/241087/apple_unveils_the_new_iphone_4s.html#tk.hp_fv">iPhone 4S</a> may look identical to the iPhone 4, but that's where the comparisons stop. Under the hood the iPhone 4S is full of hardware and software innovations that help Apple catch up with its rivals. Here’s how Apple’s iPhone 4S stacks up against its Android, Windows Phone 7 and BlackBerry competitors when it comes to specs.
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