What is a good website that is 100% free to look up cellphone numbers?

Question

I have someone playing on my phone and I want to know what number is 100% free so that I can catch the person doing this.

Answer 1

Right now the FCC forbids publishing a list of wireless phone numbers.  There are many sites that claim to be able to provide you these details but none of them are free and most of the time they don't even have the information you are paying for.  The only legitimate way to get these details is through law enforcement with a subpoena.