i need to know who a phone number belongs too

There are several different methods you can use if you decide "I need to know who a phone number belongs too". The first is to simply call back the number and see who picks up. If you don't want to be traced then you could call from a mobile phone or hide your caller ID. There are other, more sophisticated methods though that can work just as well. Here are two of the most common in more detail.
We are often bombarded with calls from numbers that do not give a name. Caller ID often fails to provide names for businesses and cellular phones. For all of the times that you find yourself thinking "I need to know who a phone number belongs too", there is a solution.