Since the early 2000's, there have been online companies offering reverse telephone lookups. This service has revolutionized "people finding." Previously, the only option for a reverse phone directory was a printed book. Local phone companies would sometimes distribute these reverse telephone directories to their customers, libraries, and law enforcement agencies.

However, there were three problems with printed telephone directories: the searcher was very limited, private numbers were not listed, and not everyone received a book. The directory only listed area information. So, if you wanted to do a reverse look up for someone three states away, you had to drive to that areas public library. If your telephone service didn't provide a directory to you, you probably didn't even know they existed.

The idea of looking up information via a phone number is such a simple concept, but such a wonderful search tool. A standard phone book has a comprehensive alphabetical listing of people with a telephone service. You can look up "Smith," and then find "Joe." There you will see Joe Smith's phone number and address. However, by listing the names in alphabetical order; the phone numbers are in random order and virtually unsearchable. A reverse phone directory actually reverses this process. It provides a comprehensive list of telephone numbers, in sequential order. This means if you know the phone number, you can find the person and address.

As mentioned above, the internet has revolutionized the reverse phone book look up process. With an online directory you can find people by: home or cell phone number, street address, or name. You can look up any business by: address, name, or phone number. An online directory combines an array of phone books, and compiles them into one database. This eliminates the problems listed above, with printed directories. Online sites are the only place you can find an unlisted number, toll free number, and cell phone number info.

So, why are online reverse phone directories useful?
There are many ways that online reverse phone directories are indispensable to the public. Say you are getting a prank call- look up the number and get the name and address. Those annoying telemarketer calls- look up the number and find out the companies name and address. Curious who a spouse or child is calling-- look up the phone number and get the name and address. Basically everything from private investigation to search for an old classmate can be aided by online reverse phone directories.

Many times an online reverse phone book look up company will also provide you with the person or business's background details, property information, financial information, etc.. There is a usually a small fee involved for using an online reverse directory.