A virtual number is a telephone number that is not directly associated with a telephone line. These numbers can be programmed to use as a local number, mobile number, toll-free number, for call forwarding, etc.
The local number is a local landline number that can be provided to the customers and public so that they can call in to reach customer care. Although, the number is prefixed with the local STD code, the number may actually be of a remote location.
This virtual number appears as a mobile number, which can be provided to the customers and public so that they can call in to reach customer care.
Toll-free numbers are a facility that companies provide to their customers and public. The cost of calls on these numbers is borne by the company. Both, local number and mobile can be converted into Toll-Free numbers. Once the user calls on a toll-free number, he may connect with an agent of the company or with an IVRS menu.
You can forward all incoming calls to another number such as that of a call center.