In Pictures: 15 iPhone apps that changed our world

The first iPhone hit the market less than five years ago -- and shook up our world. Now iPhone sightings are everywhere, with Apple lovers listening to music, playing games and staring into tiny screens. The last holdouts are coming around and finally getting a smartphone. Most people feel lost without their iPhones. Can you live without these iPhone apps?

Passbook

Let's be clear: Apple's Passbook app doesn't change our world. It's the promise of Passbook that puts this app on the list. Passbook is Apple's first step to turn the iPhone into a mobile wallet. "By introducing Passbook with its couponing, rewards and other capabilities through the iPhone, Apple is laying the groundwork so they can introduce commerce capability," J Schwan, CEO and founder of Solstice Mobile, told CIO.com.

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