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The 1st IPhone is invented and is described as "a widescreen iPod with hand controls."
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The IPhone 3G was more like the wildly successful IPhone, but had 3G networking and a built-in GPS.
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The iPhone 4 replaced the iPhone 3GS and 3G and included the same Apple-designed A4 processor found in the iPad
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The iPhone 5 further codified the 2-year iPhone release cycle, with both a visual redesign and significant hardware changes.
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The iPhone 5s continued the "tick/tock" iPhone release cycle, maintaining the exterior design of the iPhone 5 while significantly improving the underlying hardware.
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The iPhone 6 represented the most radical change to the industrial design of the iPhone since the iPhone 4.
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The iPhone 7 dramatically improves the most important aspects of the iPhone experience. It introduces advanced new camera systems.
