LG LGMS840 - Manual (Page 45)

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The Basics
5. Press the Power/Lock Key and your phone will be restored to the factory
settings. To cancel, press the Volume Keys .
Changing Your Unlock Pattern, PIN, or Password
1. Touch the Applications Key > Settings > Location & security.
2. Touch Change screen lock (under the Screen unlock section).
3. Draw your current unlock pattern.
4. Touch the type of unlock setting to change it (or touch None to remove
it).
5. You’re prompted to enter your new unlock information.