BSNL is India's largest telecommunications company, established in 2000 as a state-owned enterprise providing telecom services across India. It has over 35 million basic phone subscribers, 46 million GSM subscribers, and 2.5 million internet customers. BSNL offers a wide range of services including basic telephone, internet, broadband, 3G, GSM cellular networks, and wireless local loop. While it has advantages like mobility and nationwide coverage, it also faces disadvantages like variable internet speeds and high costs that limit its appeal to average users.