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  This is the iPhone as it first appeared in 2007, laying the foundation for the modern smartphone.
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  The iPhone 4s bought stainless steel and glass to the table, as well as a new, squarer look with rounded corners. It was unveiled as the thinnest smartphone in the world. It was also the first iPhone with a front-facing camera for making Face-time video calls, and shipped with iOS 4, which was capable of multi-tasking apps.
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  The iPhone 5s was retained a near-identical design to the iPhone 5, adding new color options instead. There were big changes inside though: the home button was upgraded to support Apple's fingerprint recognition system, Touch ID, and the device featured the first 64-bit processor in a smartphone
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  The glass was tougher and the aluminum case less prone to bending on the iPhone 6S and 6S Plus, but not much else had changed. The big new features were a pressure-sensitive display (3D Touch) and short videos captured with every picture (Live Photos).
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  The company avoided a major redesign, but still made significant changes — including a new dual-camera system for the Plus, making both models water resistant, dropping the mechanical home button in favor of a fully digital lookalike, and, yes, removing the headphone jack.
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  iPhone 8 introduces an all‑new glass design. The world’s most popular camera, now even better. The most powerful and smartest chip ever in a smartphone. Wireless charging that’s truly effortless. And augmented reality experiences never before possible. iPhone 8. A new generation of iPhone.
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  iPhone X is the biggest change the company has made to its flagship smartphone in years. With a larger screen, a better camera system for augmented reality and facial recognition capabilities, it's clear that this is Apple's vision for the future of the smartphone.