People often are curious as to what kind of information is available to search on the internet for cell phone numbers: http://ezinearticles.com/?Cell-Phone-Lookup---How-to-Reverse-Search-a-Mobile-Phone-Number&id=3871764
The answer is practically anything except for the very sensitive personal information such as financial and credit card data, including passwords and full account numbers. Other than that you might be able to uncover a lot of data about mostly anyone doing a reverse cell phone lookup. Social security numbers are generally not accessible. It is a vital security precaution not to allow Social Security numbers be available public.