Whether you are just trying to find someones name or you are trying to find much more, there is only one directory that will allow you to search for cell phone numbers.
The phone book does not include them, nor does the White pages.
You need a directory that has access to information that is not publicly registered and that is up to date.
This type of directory is very easy to find on the internet considering that their are hundreds of services that you can choose from.
Some of them offer you information about people land line numbers and some of them offer you information about unlisted numbers.
Although you may need this, a directory that includes all cell phone, land line, and unlisted number is what you really need.
To find a reverse mobile directory that includes this, you have to look a little deeper than the first page of Google.
These directories are for people that need information fast and unlimited amounts of times.
For instance, layers use them all the time to find criminal records and warrant searches.
Business people use them to find leads, and average joes use them to find peoples names and addresses.
No matter what you are going to be using it for, they are very popular and are almost a must nowadays with so many people switching to cell phones.
So if you need a service that includes cell numbers, a reverse mobile directory just might be the answer you have been looking for.