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?

Messages

Text messaging has become the preferred way we communicate with friends, replacing the venerable telephone. Now we can reach out and be reached at all times – that is, as long as there's battery life in our iPhone and we're within range of a cell tower. Messages is the telephone of our time.

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