I got a question about skype?

Ok so I prank called this place (I know its stupid but I was bored). I called them using bing 411. I honestly didn't even say anything really to start the prank. I was just starting and I could tell they knew it was a prank. This guy was saying that he has my number and he is ganna tell the cops that I threatened his life. I didn't at all but is there a way that they can find my number? I have no skype credits. I only have the free version of the account. Thanks :D