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In this chapter, we're going to look at a couple of ways to protect your iPhone from being accidentally dialed or used, or from being accessed by people you haven't authorized, as well as some things, you can do to increase the chances that you'll get your phone back, if you ever misplaced it or if it's stolen. The first feature I want to look at is Auto-Lock. The Auto-Lock feature refers to the iPhone and iPod touch's default behavior of turning off the screen after a minute or so of inactivity. This is to guard it against you accidentally tapping an icon or dialing a number from the iPhone while it's in your pocket. It also acts as a battery conservation feature. Go to Settings>General>Auto-Lock.
Here you can choose to allow anywhere between one to five minutes of inactivity before the phone or iPod locks the screen, making it so you have to press the Sleep/Wake button and slide the Unlock slider to use your device again. You can also choose Never, meaning the screen will stay on indefinitely until you lock it yourself with the Sleep/Wake button or until it runs out of battery power. Just remember that you have to manually lock your screen if you choose Never and if you forget, the battery will drain much more quickly. I think the default one-minute setting is a good one to go with. If you haven't touched your device in one minute, you probably aren't actively using it, so you can let it go to sleep.
Waking the phone up is a simple matter anyway, so you might as well choose the option that will do the most to conserve or battery power.
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