How do you find telephone numbers online?

I have a phone number and I need to know the name of the person who called. I think it may be a potential employer. How do I found out who it is... without calling the number back?How do you find telephone numbers online?
www.anywho.comHow do you find telephone numbers online?
Go to the white pages on line and do a reverse inquiry. I have to do it to get my father-in-laws address to send him cards and such. It works.
www.whitepages.com It has reverse phone number look up. If it is a cell phone, forget it.
www.reversephonedirectory.com
Here's a reverse phone lookup,


http://www.whitepages.com/10001/reverse_phone
go to whitepages.com