iPhone 4S drove many of us to cancel contracts

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iPhone 4S, Apple Wiki

Best of 2011: Apple iPhone 4S Release

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Apple and Samsung have won the smartphone wars. What's next?, Smartphones

Sell it!

New iPhones: The reviews are in

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Apple iPhone 4s - 64 GB - Black (Unlocked) for sale online

Tekcoo for iPhone 4S Case, iPhone 4 / 4G Cover, [Tmajor] Shock Absorbing Hybrid Best Impact Defender Rugged Slim Grip Bumper Cover Shell Plastic Outer & Rubber Silicone Inner [Turquoise/Grey]

A Second Chance for Idle Electronics - The New York Times

How-To: Safely prepare + wipe your iPhone for resale or trade-in - 9to5Mac