The telecom sector in India has grown from basic telephony in the 19th century to advanced 3G technologies. It is divided into fixed line and mobile segments with both public and private players. Major public players include BSNL and MTNL in fixed line and BSNL, MTNL in mobile. Major private players include Reliance, Tata, Airtel, Idea in mobile. The sector is growing at 45% annually but faces challenges of infrastructure, technology adoption and regulations. Future areas of growth include value added services and employment opportunities.