Bharti Airtel continues to lead in all the parameters, Net Adds in the last month / quarter as well as marketshare. The chart below shows market share of GSM Mobile Operators in India.
For the first time, GSM mobile operators subscriber base has crossed 200 million milestone and are marching ahead collectively without any signs of slowdown, though the rest of the Indian industry is under pressure.

Cellular phone Subscribers in Circle A & Circle B constitute bulk of Telcos’ consumers – 36.1% and 36.7%. Metro subscribers are a mere 15.3% while subscribers in Circle – C constitute 11.8% of the subscriber base. So if you are planning to be in Mobile related business, its Circle B and Circle C to look for and no more the metros.