Do You want to unlock your LG? To get unlock code for LG we need only IMEI number.
You will also need a sim card from the network that phone is currently working. Sim card will be needed when you enter unlock code to Your phone.
Codes for LG are from manufacturer database. Unlock codes are assigned to IMEI number.

NOT supported CDMA Phones IMEI starting 99xxxxxxxxxxx and 352452xxxxxxxx make sure not to submit such IMEIs, cause code will come like this SPC=000000 which is CDMA programming code.

If after enter to secret menu phone will ask for:
network lock - please enter NCK code
service provider lock - enter SPCK code.

How to enter code in LG?

To enter unlock code for LG, You need to insert sim card from network which is phone currently working and enter unlock sequence mode 2945#*xxx# where xxx is the model of LG phone numbers, for example,
for KU990 enter 2945#*990#, GT540 enter 2945#*540#. When a secret MENU is shown, choos NETWORK and enter NCK code.