The need for cell phone directory was felt by some cell phone service providers and hence companies such as Cingular, Alltel, Nextel and Sprint are planning to start Wireless Directory Assistance LLC, with a database of 411 operators that can be seen to locate cell phone numbers easily. The best advantage that comes with cell phone directories is that you can lookup cell phone number of a known person easily. It is left to the decision of the people who can decide whether they want their cell phone numbers listed in the directory or not. Though there are no cell phone directories in the United States, such directories are in use in countries such as Finland, Sweden, Denmark and others where the people have listed their cell numbers for other people’s scrutiny. People in the United States can be without the fear of calls from telemarketers because it has been made illegal.