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