Free Reverse Phone Directory Look Up

I am looking for Free Reverse Phone number directory?

is there such a thing as an actual “free” reverse phone Number Lookup website. all of the ones I have visited will say “we found your number in ———–, if you want anymore details please pay what ever amount we want to charge you”. not the actual wording but it is the actual meaning. I would like to look up some odd numbers on my phone bill and find out who is calling me…. thanks Lou

For this purpose I always use Ixquick Phone Search:

http://ixquick.com/eng/phone.html

You can look up international numbers, and so far every number I could look up via other sites, also worked here (not that I use it much).