If an unknown number is causing you a bit of grief, your first thought might be to find out who is on the other end of the line. I have tried a lot of different phone reverse lookup services.
A reverse cell phone directory is basically a database of name, numbers, and other information. However, when you have the number and not the name, the process is a bit different. However, there are reverse phone number directories, where search by cell phone number is possible.
While a reverse phone lookup can be beneficial in many ways, to really reap the benefits, you need to select a service to use carefully. Instead of paying per search, you pay one fee. This is especially helpful if they have a map or directions.
So, do yourself a favour and appreciate that there's no such thing as a free reverse cell phone look up. Paid services can provide you many advantages.