Bharti Airtel, India's largest telecom group by sales, rolled out superfast 4G mobile data packages in 296 towns and also plans to sell low-cost smartphones at a price as low as Rs 4,000.
The company has 4G spectrum in 14 circles while Reliance Jio is the only player to have these airwaves in all the 22 telecom circles. Reliance Jio, part of India's richest person Mukesh Ambani-led Reliance Industries group, is expected to launch its 4G services towards the end of the year.
Airtel also announced a tie-up with Samsung and Flipkart for offering 4G handsets. More such partnerships with other players will be announced in near future.
Announcing the launch, Bharti Airtel chief executive Gopal Vittal said: "We have now built India's first commercial 4G network that will make high-speed mobile broadband a reality."
Vittal said Airtel is talking to various handset makers for the past one year on shaping the device ecosystem for 4G.
He, however, refused to comment if the company will come with Airtel branded handsets.
Vittal said the company has increased the number of 4G mobile  sites three times in the last 60 days to provide better  services to customers.
Airtel invested Rs 1.10 lakh crore in the last five years of which Rs 50,000 crore was spent in last two years, primarily on spectrum and infrastructure. It got 4G spectrum in 2010. It first launched 4G services in Kolkata in April 2012 and since than expanded to various cities and towns.
Asked about competition from Reliance Jio and others, Vittal said Airtel has always survived in competition.
"We are children of competition in a way and we work in brutal marketplace and that makes us better and sharper."
Reliance Jio, which is now present in all 29 states with a direct physical presence in nearly 18,000 cities and towns, is testing its 4G network before the commercial launch.