Default cant get SIM network unlock PIN to come up!

so i got a Samsung galaxy mega from Tracfone. it has i527 motherboard but its labeled as a SM-S780L. i got tired of tring to root so now i requested an unlock code from unlockfusion. i finally got it but after i install a tmobile sim and boot the phone i dont get the SIM network unlock PIN menu. i get just the invalid sim on the notification. is there anyway to force the menu to pop up? any dialer code?