Knowing the phone number of any cell phone all over the world is not that difficult, you can search and find the name, location and the address of the owner of cell phone. You can find the person who carry the cell phone by many methods.
First method is by searching through the reverse cell phone number directories, there are many directories like these in the internet. Although they are free, you will spend more time to find what your search for.
The second option is by hiring a paid service that can pick the name and the address of any cell phone carrier from only the number. They are not free but you will get the information you want in seconds.
There are other options to know the personal information for any cell phone carrier around the world. Anyway, in most cases we should search on the internet to know whose phone number is this?