If you are upgrading your Airtel Wi-Fi broadband speed, please make sure that you buy another wi-fi router. The one supplied by Airtel is useless its is completely ineffective and keeps disconnecting every few minutes. I upgraded one from 2 MBPS to 8 MBPS,
And of course airtel will never tell you or guide you about this . and I am using airtel broaband since 2 years.Mostly I face connectivity issue and when I logged complaint to customers care than they also do not have any idea to resolve it but airtel broadband is best .