Location Transport

How do you track a Cell Phone location?

How or what is the best way to track someone when all you have is a cell phone number? I am looking for someone and all i have is a cell phone number. Do you have any helpful information that will help me out?

Public Comments

1. from track position software or from cell office..
2. In China, there is a site for you, that is ip138.com, and i guess there is also something like this site in other countries.