LG KF300 User Manual page 27

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, contact your network operator.
Security code (4 to 8 digits)
The security code protects against
unauthorized 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.
The security code is also required
to enable or disable the phone lock
function to prevent unauthorized
use of the phone. The security code
default setting can be modified from
the Security menu.
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