Airtel 4g at starting there was a great hype created Airtel 4g here Airtel 4g there. Guys firstly provide 2g networks nicely then create hype for 4g.
I ported my sim from BSNL to Airtel to experience 4g services provided by them but that was my wrong decision. At some places it runs like a beast but in most of the places it was still searching for the network.
Cant say how Airtel 4g can catch network on mountains and forests if it faces problem in catching network in areas like Delhi NCR.