LG VS840 - Manual (Page 50)

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The Basics
PIN: Locks the screen with a number sequence. Enter a PIN (at least 4
digits) and tap Continue. Reenter your PIN and tap OK to confirm it.
Password: Locks the screen with an alphanumeric sequence. Enter
a password (at least 4 characters) and tap Continue. Reenter your
password and tap OK to confirm it.
From then on, any time you want to turn the phone on or unlock the
screen, you will need to draw your unlock pattern or enter your PIN or
password to unlock the screen.
Disabling the lock sequence
If you change your mind about using a lock sequence to secure your phone,
you can disable it.
1. From the Home Screen, tap the Apps Key > Settings > Lock
screen.
2. Tap Select screen lock.
3. Confirm your unlock information.
4. Tap None to disable the previously set lock security.
Changing Your Unlock Pattern
1. From the Home Screen, tap the Apps Key > Settings > Lock
screen.
2. Tap Select screen lock.
3. Draw your current unlock pattern.
4. Tap Pattern to change it.
5. You’re prompted to draw and redraw your new pattern.
6. Enter a Backup PIN and touch Continue. Then confirm your Backup PIN
and touch OK.