hey i have the same problem with my phone (LG Shine) and from what i've found so far, on ATT's website and other forums, is that once this happens(if u didnt use up all of your attempts to unlock,u can call your carrier and they can help) yr sim card gets permenantly locked and u HAVE to purchase a new one...really unfortunate. Just ruined mine b4 i found this out. Nothing about PUK in phone's instruction manual. :(
Fate
July 2008