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" Q: I want to get the new iPhone, but with its full-front touchscreen, I&amp;#039;m afraid that I&amp;#039;m going to end up dialing it with my face whenever I&amp;#039;m talking. Is that going to be an issue? A: While iPhone is far from the first phone with a touch-sensitive screen, Apple is the first to make a real effort to address this worry. The iPhone has two diodes at the top of the phone, near the speaker. The first diode emits pulses of infrared light, while the second diode detects those pulses. Get the iPhone close to your ear and those pulses of light bounce back to the second diode, which then switches the touchscreen off--preventing you from accidentally hitting any buttons, as well as preserving battery life. (When the phone moves away from your face, the screen pops back on.) It wouldn&amp;#039;t be surprising to see similar technology in future revisions of competing touchscreens. While it&amp;#039;s possible to lock the touchscreens of many smartphones while on a call, it usually involves additional button presses to unlock the screen. As anyone who has used a phone like this can tell you, it&amp;#039;s very annoying to have to stop your call and press several buttons to unlock your screen before you can use the touchpad. Almost as annoying as accidentally pressing buttons with the side of your face. VIDEO: Hands-on with the iPhone LAB TEST: iPhone vs. 7 New Smartphones The Apple iPhone&amp;#039;s touchscreen automatically senses when it is near your face. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/gadgets/how-to/a2067/4221083/>