Initially had doubt about this product that i will not support airtel 4g, but i got this (version 2.4). 3g/4g has to be set to your dongle by computer airtel application. Then connect it to router, and works super. (And i heard that updating firmware is not good option).

Great router. Does what it should with no problems. Compatible and very easy to configure. I'm very happy with it thanks.

It should be noted that I received version 2.3 of this device whereas the advert says 1.0. It is important people know this as 1.0 is not compatible with LTE 4G devices where as the version I received is, which is good! Its still compatible with 3G modems too!