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Q: What iPhone model is Steve Jobs introducing in this photo?

Hint: It was the first generation of the Apple iPhone to have a glass back.

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A: iPhone 4

The iPhone 4 was announced on July 7, 2010, at the Apple World Wide Developers Conference. It was the first iPhone ever offered for sale by Verizon, ending Apple's exclusivity deal with AT&T.

Published:Caption:Photo:Justin Sullivan/Getty Images
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Q: Which iPhone model was released in the color green?

It's been the only iPhone model to date that uses the bold color.

Published:Caption:Photo:Justin Sullivan, Getty Images
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A: iPhone 5C

The iPhone 5C, available in blue, green, yellow, pink and white, was released in the U.S. on Sept. 20, 2013.

Published:Caption:Photo:Sean Gallup/Getty Images
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Q: Can you identify this iPhone just by looking at its rear?

The plasticky, white backing of the phone should be a giveaway.

Published:Caption:Photo:Justin Sullivan/Getty Images
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A: iPhone 3GS

The third-generation iPhone 3GS, released on June 19, 2009, was the first iPhone to be released in white. It was the also the first model to feature voice controls.

Published:Caption:Photo:Justin Sullivan/Getty Images
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Q: It's so cute and tiny! What is it?

The rear of this phone is silver, with a black band at the bottom.

Published:Caption:Photo:Shaun Curry/AFP/Getty Images
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A: The original iPhone

The original iPhone cost a whopping $600 (with a two-year contract, later reduced to $400) when it launched on June 29, 2007, but that didn't stop people from forming a quarter-mile-long line at Apple's flagship store in NYC to be the first to get it.

The device was revolutionary, of course, but many criticized its lack of 3G connectivity at the time.

Published:Caption:Photo:Michael Nagle/Getty Images
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Q: What is the first iPhone model to use Lightning cables?

Before this, iPhones used larger 30-pin dock connectors.

Published:Caption:Photo:Justin Sullivan/Getty Images
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A: iPhone 5

The phone, released on Sept. 21, 2012, was also Apple's first to have a 4-inch screen.

Published:Caption:Photo:Martin Bureau/AFP/Getty Images
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Q: Only one iPhone model comes in this shape and color. What is it?

Hint: It also has a 4-inch screen.

Published:Caption:Photo:Anadolu Agency/Getty Images
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A: iPhone SE

The iPhone SE, released on March 31, 2016, is based on the iPhone 5S design. Unlike the iPhone 5S, however, the iPhone SE is available in the Rose Gold color.

Published:Caption:Photo:Josh Edelson/AFP/Getty Images
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Q: "Pardon me, sir. That phone in your hand, what is it?"

Certainly no other Apple smartphone looks quite like this one.

Published:Caption:Photo:Josh Edelson/AFP/Getty Images
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A: iPhone 7

The new iPhone 7 features a dual rear camera and upgraded hardware. It doesn't have a headphone jack, though, as the phone's critics love to note.

Published:Caption:Photo:Spencer Platt, Getty Images
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Q: What was the first iPhone model released in gold?

Hint: Its home button was surrounded by a metallic ring.

Published:Caption:Photo:VCG via Getty Images
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A: iPhone 5S

This was also the first iPhone model to have a built-in fingerprint scanner.

Published:Caption:Photo:Portland Press Herald/Getty Images
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Q: What iPhone model is this?

The presence of Siri on the device is a big hint; this is the first phone she ever appeared on.

Published:Caption:Photo:Oli Scarff/Getty Images
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A: iPhone 4S

Siri was a major selling point of the Apple iPhone 4S, released Oct. 14, 2011.

According to Apple CEO Tim Cook, the "S" in the phone's name stands for Siri.

Published:Caption:Photo:Irfan Khan, LA Times/Getty Images
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