Almost everyone with a cell phone has experienced receiving phone calls from people we do not know. We can also use online resources to find phone numbers all over the world.
You can shop for things you need, and many things that you don't need. Others will try the traditional phone books that are located online only to find out that these resources do not work for either cellular phone numbers or numbers that are marked as unlisted. Or it could be a situation where the person on the other line is a long lost friend and we wish to keep in contact.
Cell numbers are generally more private, since you are charged for every call you receive, including telemarketers you don't want to talk to, although it's illegal for them to call your cell without permission. Even with the free residential phone number search you can find out the details of which phone provider owns that number and in which city they are based and this may help you recognize the number. The problem with using Yahoo and Google however is it could take you an entire day or longer to find the information you are searching for, so it is often best to subscribe to the cell phone lookup services online to get your information quicker.
When selecting a reverse phone directory, make sure they cover cell phone numbers, too. Cell numbers are typically harder to track down and you won't find them in a free service.