You have to make sure that you use reputable reverse search companies
. As a rule of thumb, the directories that give you a money back guarantee are reputable. If you decided you want to use a free directory, keep in mind that they are still paying for access to the telephone company databases. They usually recover their costs by selling email addresses to third parties. So, if you do not want your email address to be sold to others, stay away from the free reverse phone search directories.