Phone directories are used to search for the telephone number of private individuals and businesses. But the reverse phone lookup works differently. It is used to know the owner of a telephone number. Thus the term, “reverse.” The reverse phone lookup technology was deemed necessary because people can’t use the traditional telephone directory when looking for numbers. Searching through the big book by number, and not by name, will be tedious and time-consuming. So telephone companies decided to release reverse telephone directories. These were used only by law enforcers and agencies responsible for emergency situations. But with the faster, simpler, and more reliable technology today, digital reverse phone lookup is already available for everyone.