LG KU830 User Manual page 24

Unlock function
If you press the OK key, a popup screen
appears asking you to input the Security
code to unlock the phone. The Security
code is configured by selecting Settings
> Security > Change Codes. If you key
in an incorrect Security Code, the phone
will remain in Handset Lock status. If you
key in the correct Security Code, the
phone will be unlocked, and the idle
screen will be displayed. If you have
turned the phone off in the Handset Lock
status, you will find the phone remains in
Handset Lock status when you turn it on.
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