A telephone directory (also called a telephone book and phone book) is a list of telephone subscribers in a certain geographical area or subscribers to services provided by the organization that publish the directory. A phone number book may also be called phone book and may be known by the color of the paper it is printed on. White pages in phone books generally indicate personal or alphabetic listings. Yellow phone pages, golden pages, or A2Z, generally indicates a business directory classified by business type or services provided, usually with paid advertising. You can also get more information in our website.