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Introduced in 2007. Specs 3.5-inch screen and a 2 megapixel camera
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Able to connect to faster 3G-based networks, built in GPS; location services; more storage.
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Arrival of FaceTime. First high-resolution "Retina" screen
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First to have a 4-inch screen and a slimmer upgrade
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4.7-inch screen. Upgraded camera's.
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Eliminated the headphone jack, changed the home button and added a dual-camera set-up.
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Retina HD display, wireless charging, single and dual-cameras with support of Portrait lighting
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5.8-inch Super Retina display/OLED panel; TrueDepth camera system, Face ID
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6.1-inch Liquide Retina display; splash and water resistant aluminum/glass deign
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6.1-inch Liquid Retina HD display; new dual 12MP ultra wide and wide cameras; 4K videos at up to 60fps