User Guide

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 244.
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.
Turn Simple Passcode on or o: Choose General > Passcode Lock, then turn Simple
Passcode on or o.
A simple passcode is a four-digit number. To increase security, turn o Simple Passcode
and use a longer passcode with a combination of numbers, letters, punctuation, and
special characters.
Turn Voice Dial on or o (iPhone 3GS or later): Choose General > Passcode Lock,
then turn Voice Dial on or o.
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 example, parents can restrict explicit music from being seen on playlists, or turn o
YouTube access entirely.
Turn on restrictions:
1 Choose General > Restrictions, then tap Enable Restrictions.
2 Enter a four-digit passcode.
3 Reenter the passcode.
Turn o restrictions: Choose General > Restrictions, then enter the passcode. Tap
Disable Restrictions, then reenter the passcode.
Important: If you forget your passcode, you must restore the iPhone software from
iTunes. See “Updating and Restoring iPhone Software” on page 244.
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Chapter 25 Settings