iPhone 6S review: Good in many ways, but it'll benefit a lot from iOS 12

3D Touch and blistering performance make the iPhone 6S a must-have upgrade for any iPhone 5S owner
Still good in many ways, but it’ll benefit a lot from iOS 12

Apple iPhone 6S review: The oldest iPhone can't compete with Apple's newer models - CNET

iOS 15 brings powerful new features to stay connected, focus, explore, and more - Apple

Apple iPhone 6S review: The oldest iPhone can't compete with Apple's newer models - CNET

iPhone 6s Review: A Slightly Better iPhone 6 - WSJ

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iPhone 6 - Wikipedia

iPhone 12 review

iPhone 6S review: Good in many ways, but it'll benefit a lot from iOS 12

iOS 14 on the iPhone 6S and SE: Performance is fine, other stuff is not

iPhone 12 review: Reinvents the iPhone

iPhone 6S review - The Verge

Apple iPhone 6s Plus Review - IGN