There are few things in the world, that we can still get for free. You can look up phone numbers for free. The website of whitepages.com will allow this. A cell phone number won't work for free or a number that is unlisted.
Utilize this one - http://tinyurlz.info/reverse-phone-lookup You may do a free of charge free phone number scan. At the very least you can observe if any information can be found free of charge. They do ask for a tiny service charge for complete details as many comparable organizations.