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The IPhone is the first smartphone model designed by Apple.
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IPhone 3G adds several new hardware features, such as GPS, 3G data and tri-band UMTS/HSDPA.
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The iPhone 4 introduced a new hardware design to the iPhone.
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The iPhone 5 featured an aluminum-based body which was thinner and lighter than previous models and a taller screen
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The IPhone 5c brought color to the back surface
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The IPhone 6 is a bigger version and is faster
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The iPhone 7 features a new quad-core system-on-chip
