Interested in getting an address from a phone number? In other words, you have a phone number and you want to find out more information about that number, of the address to which that phone number belongs. Even better, do you have a cell phone number and you want to find out who that number belongs to? This is a form of personal investigation and a number of sources on the internet provide this service for a cost.
For whatever reason you require this service, it is a popular requirement for many people. It is often referred to as reverse lookup and works by having a large database of phone numbers, addresses, names and other information. Once you have access to such a database you can then search a phone number (can be cell phone or a land line number, it doesn't matter) and find out information about that number.
So where to go for such a service? There are a number of places on the internet that you can visit and get this service, unfortunately they all cost money. However, some are a lot better and have more unlisted numbers than others, and only some provide you with the ability to trace cell phone numbers.
By far the best one I have stumbled across is this one here. It has the largest database of unlisted and cell phone numbers and provides it at a lower cost than many companies out there.