LG L1100 User Manual page 236

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.
Barring password
The barring password is required when you use the Call barring
function. You obtain the password from your network operator when
you subscribe to this function. See page 92 for further details.
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