Motorola RAZR V3

i have been gettin some prank phone calls lately. they have stopped.. for now. the caller uses *67 to block his call. i was wandering if there is any product out there where you can plug your phone into the computer and you can basically "unblock" the private number to get the actual number they are calling with. i only want this to simply call his parents/guardians and tell them the situation so it will stop, nothing else. i would highly appreciate the help... thanks in advance. NOTE: i DO hook my razr to my copmuter often.. i just need a program to retrieve this number.