Photos: Motion-sensing phones

Apple's iPhone, set to debut in June on AT&T's wireless network, uses accelerometer technology to detect when the device is rotated from the portrait (or vertical) position to the landscape (horizontal) position. It then automatically changes the display, allowing the user to determine which position is best for viewing a particular Web page, video or photo on the phone's screen.

The iPhone also has a proximity sensor that detects when a user lifts the device to the ear; the sensor immediately turns off the display to save power and prevent inadvertent screen touches until the iPhone is moved away.