Random phone numbers are a complete pain, especially when the person on the other side of the phone is prank calling you or bugging you. If this is the case for you, you know that it may be time to find out who the person is so you can eliminate the phone call once and for all.
Not knowing who called is tough because you don't know what it is that they wanted. For example, it could be a long lost friend that somehow received your number. Or, it could be some person that you really do not want to have your number. Either way, it is important to find out who it is so you know for sure if they are important for not.
One way to do this is by using a reverse phone lookup. This is a service that allows you to search for all types of numbers including cell phone, land line, and unlisted numbers, and find information such as...
-Names, Addresses, Criminal Records, Warrant Searches, Background Checks, etc.
These directories are unlike the phone book in that they allow you to search for numbers in reverse. So instead of looking up people by their last name or their address, you can find them just by their number. This cuts the time down on finding people and allows you to search for people in a very short period of time.
So take the time to find a reliable directory and you will find exactly what you are looking for.