LG U8110 Owner's Manual

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PUK code (4 to 8 digits)
The PUK (PIN Unblocking Key) code is required to unlock a
blocked PIN code. The PUK code may be supplied with the
USIM card. If not, contact 3 Customer Services for the code.
If you lose the code, contact 3 Customer Services.
PUK2 code (4 to 8 digits)
The PUK2 code, supplied with some USIM cards, is required to
unlock a blocked PIN2 code. If you lose the code, contact 3
Customer Services.
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. 
Barring Password
The barring password is required when you use the call barring
function. The password is obtained from the 3 Customer
Services when you subscribe to this function.
U8110 User Guide  ll   General Functions  
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General Functions