User's Guide

APPLE CONFIDENTIAL — First Draft (1.10.11)
Important: On iPhone 3GS, you must also restore iOS software to enable data
protection. See “Restoring iPhone” on page 256.
Set a passcode: Choose General > Passcode Lock and enter a 4-digit passcode, then
enter the passcode again to verify it. iPhone then requires you to enter the passcode
to unlock it or to display the passcode lock settings.
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Change the passcode: Choose General > Passcode Lock, enter your passcode, and
tap Change Passcode. Enter your passcode again, then enter and reenter your new
passcode.
If you forget your passcode, you must restore the iPhone software. See “Updating and
Restoring iPhone Software” on page 256.
Set how long before your passcode is required: Choose General > Passcode Lock and
enter your passcode. Tap Require Passcode, then select how long iPhone can be locked
before you need to enter a passcode to unlock it.
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and use a longer passcode with a combination of numbers, letters, punctuation, and
special characters.
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Erase data after ten failed passcode attempts: Choose General > Passcode Lock,
enter your passcode, and tap Erase Data to turn it on.
After ten failed passcode attempts, your settings are reset to their defaults and all your
information and media are erased:
 On iPhone 3GS or later: by removing the encryption key to the data (which is
encrypted using 256-bit AES encryption)
 On iPhone 3G: by overwriting the data
Important: You can’t use iPhone while data is being overwritten. This can take up to
two hours or more, depending on the model and storage capacity of your iPhone. (On
iPhone 3GS or later, the encryption key is removed immediately.)
Restrictions
You can set restrictions for the use of some apps and for iPod content on iPhone. For
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YouTube access entirely.
Turn on restrictions:
1 Choose General > Restrictions, then tap Enable Restrictions.
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Chapter 25 Settings