So you bought an LG Optimus L3 on T-mobile network and wanting to unlock it so that you can use phone on another carrier? You ended up at right place for the guide. Folks at Android forum have done it again, they have successfully unlocked LG Optimus L3.
How to unlock LG Optimus L3?
1. Insert not allowed SIM card
2. Power on the handset phone will display phone restricted
3. Select Cancel phone will display phone restriction code
4. Enter the SIM unlock code (Click here to get your LG Optimus L3 E400 Unlock Code)
5. Select OK the handset is now successfully unlocked
OR
1. Power on your phone with the original SIM card
2. Enter 2945#*400#
3. A menu will pop up, select Unlock USIM then Network
4. Enter code Sent and press ok
That’s it!
Unlocking your LG Optimus L3 E400 is as easy as 1-2-3.
LG Optimus L3 Phone Photos - LG Cell Phone Pictures

It’s the steps I performed to get a 100% stock AT&T image working on my P930 LG Nitro HD. Hope this helps you.
What you will need:
How to flash LG Nitro HD Steps:
Read more: http://forum.xda-developers.com/showthread.php?t=1597488&page=3
I’ve just updated my LG Nitro HD to the latest software version LG-P930-V10j-FEB-26-2012 and tying to root it. I’ve tried superoneclick all versions from 2.3.1 – 2.3.3. With v2.3.1 I got to step #7 and the program hangs just like everyone has said and with the other 2 versions it stopped responding at Starting ADB server.
How can I even root? Is there a way to root? Or that there is no any way at all to root the most recent V10J software? If you have any idea leaving here I would be eternally grateful.
LG Nitro Phone Photos - LG Cell Phone Pictures

