The security code for LG KP500 is "0000". This is the default setting, which means it was programmed into the phone prior to leaving the manufacturer's premises.
The default security code can either be changed to a code that the user wants or unlocked to be used without a security code. To unlock the phone, the device should be switched on with the SIM card still inside. The user should enter "1809#*500#" and press the "call" button. When the SIM unlock mode appears, the security code should be entered prior to rebooting and switching off the phone. The phone is unlocked when it is switched on again.
LG KP 500 comes with a default PIN code, as well. This PIN code is "7890".