Can you trace a prank?BESIDES calling the cops?

Question

im "friend" is having a birthday party...he prank called my house and i have the idea that it was him,because its all guys.(no offense)and i just wanna make sure it was him.so i can beat him at his own game!!

Answer 1

no!!! not if you use *67 before the number!!!

Answer 2

*69

but the other call has not to be private