I unlocked my AT&T G2. Received the code in 15 minutes.
$1.70 (DOLLAR AND SEVENTY CENTS) only
Update: Thanks to "paffinity" for the confirmation. It works and is genuine. This is the email address "email@example.com" of the guy who sent's these unlock codes, he replied to my email yesterday confirming that he can unlock LG G2 AT&T and T-mobile phones. Not sure about Verizon you have to ask him only.
Thanks to"amorek13" confirmed working for t-mobile as well.