Lg Optimus T P509 unlock succeed with the help of LGE tool here is the screenshot and procedure to enter unlock code

LG Optimus T P509 Unlocking Instructions:

1. Input a non accepted simcard
2. Lg P509 Phone will display enter "Sim network unlock PIN"
3. Input the unlock code that was emailed to you
4. Phone is unlocked!

OR

1. After turning on your mobile phone, press: 2945#*509# or *#865625#
2. Press Yes to continue.
3. Enter the 16 digit Subsidy Unlock Code
4. Enter the 16 digit Subsidy Unlock Code, again.
5. Device should say: "Network Lock Deactivated"
6. Phone may automatically reboot