LG U8290 User Manual page 20

Getting Started
PUK2 code (4 to 8 digits)
The PUK2 code, supplied with some SIM cards, is
required to unlock a blocked PIN2 code. If you lose the
code, contact your network operator's customer
service.
Security code (4 to 8 digits)
The security code protects the 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 restore the handset to factory setting.
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