How to Tell an iPhone 4 from a 4s: 8 Steps (with Pictures)
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Key Differences Between the iPhone 4S and 'iPhone 5' Battery? [Photos] - iClarified
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Apple iPhone 4S: Thoroughly Reviewed
Photos of iPhone 5 Battery in Rear Shell, Compared to iPhone 4S Battery - MacRumors
What's the difference between the iPhone 4 and iPhone 5 chargers? - Quora
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iPhone 4S - Wikipedia
Key Differences Between the iPhone 4S and 'iPhone 5' Battery? [Photos] - iClarified
All Differences Between the iPhone 4 and iPhone 4S: EveryiPhone.com
Is the iPhone 4S's battery actually better than the iPhone 4's despite having less standby time? - Quora
All Differences Between the iPhone 4 and iPhone 4S: EveryiPhone.com
Retro review: I bought an iPhone 4s and spent a day with it | Technology News,The Indian Express