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?

iTunes & App Store

The iPhone has given people a powerful sense of instant gratification. You want something? You're entitled to it right now. You've probably listened to a song on the radio, Pandora or on Youtube or identified a song on Shazam and decided that you must have it in your music library. Tap on iTunes and download it instantly. Maybe what you need is a certain app functionality. Tap on App Store and it will soon be yours. Waiting until you get home is for rookies.

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