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The iPhone display responds to three sensors: a proximity sensor that
shuts off the display and touch screen when the iPhone is brought near the face
to save battery power and to prevent spurious inputs from the user's face and
ears, an ambient light sensor that adjusts the display brightness which in turn
saves battery power, and an accelerometer, which senses the orientation of the
phone and changes the screen accordingly, albeit in only one 90 degree
direction.
The iPhone has three hardware switches on its sides: ringer on/off,
sleep/wake, volume up/down. All other multimedia and phone operations are done
via the touch screen.
A single frontal hardware button brings up the main menu of the iPhone.
Subsequent selections are made via the touchscreen. The iPhone utilizes a
full-paged display, with context-specific submenus at the top and/or bottom of
each page, sometimes depending on screen orientation. Detail pages display the
equivalent of a "Back" button to go up one menu.
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