Using this service, you get all level code to unlock your LG : 

SIM_UNLOCK 
NSLCKUNLOCK 
CLCKUNLOCK 
PCKUNLOCK
ESLCKUNLOCK 
SP_LOCK 

Before request a code for LG, please be sure to find the code entry instructions before to order here : 

http://www.realunlocks.com/faq

At the moment there is no solution to enter the code in U900, U880, U890, U400 and some more. 

So please check first you can enter a code before to order a code for LG !