Reverse Cell Phone Lookup Sites - Do They Really Work?

Reverse phone lookups can come in very handy when you are trying to locate somebody and all the information you have on this person is, a phone number.
There are several free reverse phone lookup services on the internet that will very easily provide you with the name and address of the person who owns that particular phone number.
If the phone number you are trying to trace is a land line, the whole process is very straightforward. You enter the phone number as a search term in any of the major search engines and the search results will display all the sites where the number may be present.
Alternately you could conduct a reverse phone lookup on popular social networking sites including USFreeAds, MySpace, GumTree, BoardTracker and Blogger or even sites such as Whitepages.
However, in a world where cell phones reign and unlisted phone numbers are the order of the day, free reverse phone lookups have severe limitations in that these free sites do not have access to any cell phone numbers.