Does using *57, *77, and any other of those *_ _ cost money?

Question

Someone had been prank calling me for the last couple of days and people here on yahoo answers said to dial *57, *77 or other numbers after they called to trace the call. So do these cost money? If so, how much?

Answer 1

It normally does. I was just researching this yesterday and it seems it is free on a very few services. It can cost from 3 dollars a month to 7 dollars a month.

on verizon which is what i have, you need a special service (or it appears this way) to block a phone number. For verizon i think the # block is *66.