On the top-right edge of the iPhone, you’ll find a metal button shaped like a dash. This, ladies and gents, is the Sleep switch.
It has several functions:
• Answer call/Dump to voicemail. When a call comes in, you can tap the Sleep button once to silence the ringing or vibrating. After four rings, the call goes to your voicemail. You can also tap it twice to dump the call to voicemail immediately. (Of course, because they didn’t hear four rings, iPhone veterans will know you’ve blown them off. Bruised egos may result. Welcome to the world of iPhone etiquette.)
• Sleep/Wake. Tapping it once puts the iPhone to sleep—into Standby mode, ready for incoming calls but consuming very little power. Tapping it again turns on the screen so it’s ready for action.
• On/Off. The same switch can also turn the iPhone off completely so it consumes no power at all; incoming calls get dumped into voicemail. You might turn the iPhone off whenever you’re not going to use it for a few days. To turn the iPhone off, press the Sleep switch for 3 seconds. The screen changes to say slide to power off. Confirm your decision by placing a fin- gertip on the right-pointing red arrow and sliding to the right. The device shuts off completely.
To turn the iPhone back on, press the switch again for 1 second. The chromelike Apple logo appears as the phone boots up.
• Force restart. The Sleep switch has one more function. If your iPhone is frozen, and no buttons work, and you can’t even turn the thing off, this button is also involved in force-restarting the whole machine.
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