Hello friends I buy airtel 4G sim before 15 days. In this time interval I noticed that airtel 4G service is not good it is bad in comparitive with 3G service . I talk with customer care then they say for slot 1 but after that I can’t see any increment in speed.Its speed is nearly 0 or 10kb in both browsing or downloding what you do it doesn’t have any matyer. If you have airtel 4G then you can also noticed this one. So please my dude if you want to go buy 4G sim then please dont buy airtel 4G, thank you dude.