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The iPhone 4S and the iPhone 4 compared - The Washington Post
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Apple iPhone 4S review: Apple iPhone 4S - CNET
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iPhone 4 review | Engadget
iPhone 4s Review: Features, Specifications, and Pricing | Macworld
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Apple iPhone 4S: Thoroughly Reviewed
Apple iPhone 4S: Thoroughly Reviewed
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iPhone 4s - Wikipedia
iPhone 4S Review | Trusted Reviews
Identify your iPhone model - Apple Support
How to Tell an iPhone 4 from a 4s: Differences Explained
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Review: Apple iPhone 4S | WIRED
iPhone 4S - Technical Specifications
iPhone 4S review - The Verge
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