Be Careful before buying airtel dongle. It is having worst network, worst customer care which would take your request and their technical team would close it down without visiting site or confirming with customer. For past 9 months I have been paying them 850 for a plan which I am not able to consume due to their speed issues.
I have escalated them multiple times and even degraded the plan to 250 but none of their technician is able to resolve the issue and finally they have mentioned that this is the maximum speed which they can offer which is 10kbps.