There is no stopping for the India's largest mobile telephone company Bharti Airtel. It may have taken over a decade to add 50 million subscribers, but the next 50 million, Bharti believes, will come in less than three years. But it is not just the 100 million mobile users Airtel is betting big on. Armed with DTH service licence, Bharti is all set to ring in competition in the satellite TV space dominated largely by Dish TV and Tata Sky.