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Chapter 8 Settings 97
Auto-Lock
Locking iPhone turns off the display to save your battery and to prevent unintended
operation of iPhone. You can still receive calls and text messages, and you can adjust
the volume and use the mic button on the iPhone Stereo headset when listening to
music or on a call.
Set the amount of time before iPhone locks
Choose General > Auto-Lock and choose a time.
Passcode Lock
By default, iPhone doesn’t require you to enter a passcode to unlock it.
Set a passcode
Choose General > Passcode Lock and enter a 4-digit passcode. iPhone then requires
you to enter the passcode to unlock it.
Turn passcode lock off
Choose General > Passcode Lock and tap Turn Passcode Off, then enter your passcode.
Change the passcode
Choose General > Passcode Lock and tap Change Passcode, enter the current passcode,
then enter and reenter your new passcode.
If you forget your passcode, you must restore the iPhone software. See page 120.
Set how long before your passcode is required
Choose General > Passcode Lock > Require Passcode, then select how long iPhone can
be locked before you need to enter a passcode to unlock it.
Network
Use the Network settings to configure a VPN (virtual private network) connection,
access Wi-Fi settings, or turn Data Roaming on or off.
VPN
VPNs are often used within organizations to allow you to communicate private
information securely over a non-private network. You may need to configure VPN,
for example, to access your work email on iPhone.
iPhone can connect to VPNs that use the L2TP or PPTP protocol and optionally use
either RSASecurID or CRYPTOCard for authentication. VPN works over both Wi-Fi and
cellular network connections.
Configure VPN
Choose General > Network > VPN and tap Settings. Ask your network administrator
which settings to use. In most cases, if you’ve set up VPN on your computer, you can
use the same VPN settings for iPhone.