I think airtel is the best 4G sim in india its speed was mindblowing but sometimes this sim is get downword into 4to128 kb/ps but sometimes this sim grow up into 20 mb/ps this speed is really really good. And its connection was too good. Airtel’s many tower standing in my town. So incoming connection is full in my mobile I have three airtel sim. This sim is so good about its survice its survice was very fast and its costomer care is always ready to end your problem. And Airtel surve you many offers about data plains and talktime plans. So after all this sim is really good about it’s all survice