User Guide

Security Features
Security features help protect the information on iPhone from being accessed by others.
Passcodes and Data Protection
You can set a passcode that you must enter each time you turn on or wake up iPhone.
Set a passcode: Choose Settings > 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.
Setting a passcode turns on data protection (iPhone 3GS or later). Data protection uses
your passcode as the key for encrypting mail messages and their attachments stored
on iPhone. (Data protection may also be used by some apps available in the App Store.)
A notice at the bottom of the Passcode Lock screen in Settings indicates when data
protection is enabled.
To increase the security of iPhone, turn o Simple Passcode and use a longer passcode
with a combination of numbers, letters, punctuation, and special characters. See
“Passcode Lock” on page 202.
Important: On an iPhone 3GS that didn’t ship with iOS 4 or later, you must also restore
iOS software to enable data protection. See “Restoring iPhone” on page 257.
Prevent voice dialing when iPhone is locked: In Settings, choose General > Passcode
Lock and turn Voice Dial o. Unlock iPhone to use voice dialing.
Find My iPhone
Find My iPhone helps you locate and secure your iPhone using the free Find My iPhone
app on another iPhone, iPad, or iPod touch, or using a Mac or PC with a web browser.
Find My iPhone includes:
 Locate on a map: View the approximate location of your iPhone on a full-screen map
 Display a Message or Play a Sound: Lets you compose a message that will appear
on your iPhone screen, or play a sound at full volume for two minutes, even if the
Ring/Silent switch is set to silent
 Remote Passcode Lock: Lets you remotely lock your iPhone and create a 4-digit
passcode, if you haven’t set one previously
 Remote Wipe: Lets you protect your privacy by erasing all media and data on
iPhone, restoring it to factory settings
Use Find My iPhone: You need to turn on Find My iPhone on iPhone before you can
use these features. See “Setting Up MobileMe Accounts” on page 26.
To locate your missing iPhone and use the other Find My iPhone features, download
the free Find My iPhone app from the App Store on another iOS device, or sign in to
me.com in a web browser on a Mac or PC.
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Chapter 3 Basics