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Built into iPhone 3G are two small but
intelligent sensors that pick up cues from the environment and adjust
the screen accordingly. These sensors both work to maximize the battery
life and improve your iPhone experience.
Ambient light sensor
The ambient light sensor in iPhone automatically brightens the display
when you are in sunlight or a bright room and dims it in darker places.
Proximity sensor
When you lift iPhone to your ear, the proximity sensor immediately turns
off the display to save power and prevent inadvertent touches.
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