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The button on top turns the iphone on. It will say 'Slide to unlock' on the screen when you've turned it on. You slide your finger across and the iphone will unlock unless you've put a password on it.
However if you wonder about the technology, they basicaly use the technology from Android, which is a touch screen making company, making some of the best touch screen phones, Iphones, means you are refering to apple, Android has better battery life howver, but apple has better apps, so its a slight trade off,
Hope i helped,
Pliskin132
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