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Apple iPhone 4S review
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iPhone 4 vs. iPhone 4S Specs Showdown - Fight! [Comparison Chart] | Cult of Mac
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Complete Replacement Battery Kit for iPhone 4S + Extra Accessories – Cell Phone DIY
Survey: iPhone 4S owners love Siri, and hate the short battery life - GeekWire
Apple Confirms Battery Life Problems Are iOS 5 Related | WIRED
iPhone 4S Battery Life Problems Befuddle Apple Engineers, Owners | HuffPost Impact
iOS 7: How to improve your iPhone 4S and iPhone 5 battery life, and reduce lag - ExtremeTech
