The display responds to three sensors: a proximity sensor that shuts off the display and touchscreen when the iPhone is brought near your 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 and 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.
A single frontal hardware button brings up the main menu. Subselections 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.
The iPhone has three hardware switches on its sides: sleep/wake, volume up/down, ringer on/off. All other multimedia and phone operations are done via the touch screen.
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