A reverse lookup phone directory can come in handy for various reasons but a popular reason today is to catch out a cheating partner and have evidence to prove it.
On the flip side you may not suspect your partner is cheating but you want to put your mind at ease and stop stressing that the person behind the number that keeps calling your partner is not someone out to steal them from you! Just imagine your boyfriend/girlfriend or husband/wife trying to convince you that they haven't been unfaithful when you have the name, address and other personal details of the person behind the unfamiliar number that keeps contacting your partner.
They will be clueless as to how you have managed to dig up this information on your own.
They'll probably think you've hired a private investigator but there's no need to go to that much expense! There is a reverse lookup phone directory service that has a database of information on the details of the owners of almost all the cell phone numbers in use.
It takes a lot of work to keep this up to date and accurate which is why they charge a small fee.
You can try and find the information out on your own but you'll have a tough time and there's no guarantee that anything you do find is accurate.
You can save yourself so much time and frustration by using the service of a reverse cell phone directory.
I actually think they could get away with charging a lot more for their service but hopefully they'll keep it at the low price forever.