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The original iPhone had no third-party apps, no GPS and no video recording.
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Also missing from the original iPhone was 3G support, the top data speed of the time, though this was added to the second generation the following year (along with GPS).
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The 2009 model of the iPhone did bring with it video recording capabilities for the first time, and the camera itself got an upgrade too.
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It was the first iPhone with a front-facing camera, the first iPhone with some level of multitasking, and one of the most significant iPhones Apple has ever made.
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The camera did get an upgrade up to 8 megapixels and perhaps the biggest improvement on the software side was the arrival of Siri
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It added an extra row of icons with an extra-tall screen, introduced the Lightning connector and had a lighter, aluminium casing.
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Apple decided to start releasing not one but two iPhones every September. The iPhone 5C was very much a rebadged iPhone 5 with a few cosmetic changes, giving iPhone buyers an option that was cheaper but still brand new for the first time.
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The iPhone 5S was the flagship model for 2013, with a revamped design and a little feature called Touch ID introduced to the iPhone line-up for the first time. Another first was the 64-bit A7 processor inside the phone, an architecture change that other manufacturers have since followed.
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The iPhone 6 extended the display size to 4.7 inches and added in more pixels to boot. Plus a significant upgrade for the camera, giving better photo and video results than ever before.
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With a display of 5.5 inches from corner to corner, it's the biggest iPhone ever.
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The iPhone 6S is almost identical to 2014's iPhone 6, to the point that we could barely tell the difference between the two in the hand, with a little extra thickness and weight
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we didn't expect it to look like the iPhone 5 but with completely whizz-bang up-to-date innards.
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Additional new features in the iPhone 7 and iPhone 7 Plus include IP67 water resistance, a new pressure-sensitive home button, significant camera improvements , a much faster processor , stereo speakers, and a taptic engine enhancements and improved battery life.
