Sim card unlocked topic

i POST HEAR BECAUSE i WAS USING A lg p710 ...i FOUND A SIM CARD "T MOBILE" and I enter it in my LG II P710 BUT WAS LOCKED..i TRYOED 3 times to enter a pin but now is "waiting" puk ..My question is...There is a way how I can get the puk number ?So the oroblem is not the phone but the sim card.
Thank's
Helen
:)