If you want to know the personal details for free, there are certain sites like ‘Free reverse cell phone directory’ or ‘National Cellular Directory’ that give you the numbers of the cellphone owners for free in return of you providing your own name and phone number. However, there is a downside to these sites. They may use your numbers to message you advertisements and send you spam.One more way is to go for certain directories in which people voluntarily provide their contact information.

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These databases are made available to general public, over the Internet with their consent. These may be business networking sites, which list the private cell phone numbers of their subscribed members. They may also turn out to be alumni sites of certain colleges and universities which are created so that classmates can stay in touch with each other.These were the ways in which you can locate almost any person in the USA, if you have his full name. As I have mentioned before, there are many sites that offer it for free, but if you want more brief information/details, you have to pay a nominal fee. It is good practice to keep a permanent phone number diary as a hard copy and a soft copy on your computer. You never know whose number you may require and its always good to be prepared!