To begin with, let's clarify something - the term "reverse cell phone number online book" does not refer to an actual book or directory, like your local Yellow or White Pages. What the term "cell phone book" does refer to is a service for conducting reverse cell phone lookups. Whatever you call it, the capability of looking up the identity of the owner of a private, unlisted phone number with no other information to go by is not only a convenience, it is a tool of great value to anyone who uses the telephone.The Internet: A Free

• (Albeit Limited) Cell Phone Book

Of course, we all want something for nothing. And so, our first inclination when trying to trace cell phone numbers free and lookup any cell number's owner is to use the internet. But the information available to and from so-called "free reverse cell phone books" comes from public sources that people voluntarily submit their information to, such as when people:

• Fill out online forms (as when signing up for free reverse cell phone book services).

• Post classified advertisements.

• Set up MySpace or Facebook pages (or those of other social networking and bookmarking sites)

• Participate in online bulletin boards, discussion groups, and forums.

• Subscribe to opt-in mailing lists.

• Are listed on the website for their company/employer or civic organizations they belong to.

As such, the databases of these free reverse cell phone trace books - otherwise known as reverse cell phone number directories - are quite small and so the odds of finding any information (current and accurate or otherwise) are also quite small.