I would write this here cause I am very disappointed. Worst network and worst service. I took this dongle as I was told I will get 10MBPS and also was very impressed. But now understood all is gimmicks to sell their dongle with cheap rates and stuff.
I think I contacted 4G customer care almost 30 times now and wrote around 15 emails. But everytime I write they ask me provide your details we apologize. But of no use. Seriously opt for any other network provider than this who will provide you a better service.
Airtel does not give what they promise. Please give a second thought before you take a step to buy.