reverse lookup by address
In case you want to look up a contact number and locate information on the owner of the number, there are definitely plenty of services that promise to be able to do this. Like with anything else, you'll get a few of truly special services, as well as plenty of average or worse services. Thus let's look at some of the things to keep an eye out for to tell whether a look up service is worth your cash or not.
First and foremost, the directory obviously needs to get the number you want to look for in its database. Many directories which don't find anything for your investigation will (rather than give a "no results" message) just give a "results pending" message, making you think that they'll have the number you're searching for in their database soon. In fact, it is very unlikely they'll possess the number your hunting for in their database in the long run, so any database that does not return results isn't worth your time.
Secondly, the service should have a money-back guarantee. It could possibly be that they have information on the owner for a number you enter, but it's outdated or irrelevant. In this case, the hunt will likely be useless to you, which means you want to discover a service that offers a guarantee. The policy should be that if your search returns no results or gives inconsequential advice, then you don't have to pay anything (it's only fair).
Something else you can certainly do is do a Google search on the company. If a "service" or business assuring to look up telephone people directory name white numbers for you is an outright scam, then a Google search will disclose that. Remember, you can't hide the truth from the internet. If a business has an extremely bad reputation then a Google search will tell you that.
Well, if the above three things are all favorable, then it's a very good sign that they offer a good service well worth paying for. The last thing you are able to do is take a look around their site. Look at their "about us" page, and read their FAQ (if they have one). Frequently, you will still have doubts in your mind, and reading these pages may provide you with the answers you need.