LG Chocolate User Manual page 160

Installation
PUK code (4 to 8 digits)
The PUK (PIN Unblocking Key) code is
required to unlock a PIN blocked phone. The
PUK code may be supplied with the SIM card.
If not, contact your network operator for the
code. If you lose the code, also contact your
network operator.
PUK2 code (4 to 8 digits)
The PUK2 code, supplied with some SIM
cards, is required to change a blocked PIN2
code. If you lose the code, please contact
your network operator.
Security code (4 to 8 digits)
The security code protects the unauthorised
use of your phone. The default security code
is set to '0000' and the security code is
required to delete all phone entries and to
activate the Reset settings menu.
Also, the security code is required to enable
or disable the phone lock function to prevent
unauthorised use of the phone. The security
code default setting can be modified from the
Security settings menu.
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Barring password
The barring password is required when you
use the Call barring function. You can obtain
the password from your network
operatorwhen you subscribe to this function.