I have a friend who has forgotten his phone number and pin number he can't switch on his phone because it requires a pin he forgot. He has already attempted once and he is left with two chances. I advised him to attempt it until it is blocked then we can request for a PUK to unblock the sim afterwhich we can enter a new pin. The problem is that he doesn't know the phone number of the sim. May I please be helped out to trace the phone number using the sim card serial number.