Airtel has started the 4G service in Chennai. As they gave an option for automatic upgrade without any cost to existing 3G users just tried it by changing to 4G sim and I should say the 4G speed of data is exceptionally fast. The pages load just in seconds. I could just compare it with the fiber optic internet connection. Need to see how they are going to price it. All 3G phones would become obselete now.
http://www.thehindu.com/news/cities/chennai/airtel-launches-4g-trails-in-chennai/article7207875.ece
http://www.thehindu.com/news/cities/chennai/airtel-launches-4g-trails-in-chennai/article7207875.ece