Mahanagar Telephone Nigam Ltd. is a telecommunications service provider in India. The Company operates through MTNL Delhi and MTNL Mumbai. MTNL Delhi is responsible for the operation, maintenance and development of telecommunication services in Delhi. MTNL Mumbai is responsible for operation, maintenance and development of telecommunication services in Mumbai. The Company offers a variety of services. These include voice services, such as POTS (plain old telephone services) with a variety of phone plus services; data services through x.25-based packet switched public data network called I-Net; Internet services, integrated service digital network (ISDN) to meet the requirements of customers for data, voice and video on one line; intelligent network service, such as virtual private network, premium rate service, universal access network and more; wireless local loop, available in both fixed and portable modes; voice mail; paging, and other services.