A Toll-free number is a cloud-based contact number used by businesses to enable their customers to call them free of cost. A toll-free number is also known as free call or freephone and starts with a specific prefix number. The numbers mostly have a prefix number beginning with 1800, 800, 888, 855, etc., representing a particular geographical code. It is similar to that of code applicable to a geographical area. The toll-free numbers begin with the prefix 1800, followed by six or seven-digit unique numbers in India.