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Apple CEO Steve Jobs unveiled the first iPhone on Jan. 9, 2007.
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On June 9, 2008, a year after the original iPhone went on sale, Apple rolled out its successor, the iPhone 3G.
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Again at WWDC, Apple Steve Jobs announced the next iPhone, a faster version called the iPhone 3GS
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The redesigned iPhone 4 arrived on June 7, 2010 in tandem with the newly-renamed iOS 4, and marked the arrival of FaceTime video chat.
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In a change of pace, Apple unveiled the iPhone 4S on Oct. 4, 2011, a few weeks after Steve Jobs stepped down because of health issues.
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The iPhone 5, the first version to have a 4-in. screen, arrived on Sept. 12, 2012, as CEO Tim Cook touted the faster, slimmer upgrade to the iPhone 4S during a 90-minute presentation in San Francisco.
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Last Sept. 10, Apple CEO Tim Cook rolled out not one, but two iPhones: the upscale iPhone 5S (now in gold, in addition to the usual white and black), and the colorful, less-expensive iPhone 5C.
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For the second year in a row, Apple unveiled two iPhones: the iPhone 6, which has a 4.7-in. screen, and the iPhone 6 Plus, with a 5.5-in. screen.
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Apple's iPhone 6S and 6S Plus represent meaty upgrades to the 2014 models on which they're based.
