I am using airtel network from 2009 still does not have any trouble and problum
Airtel is better network operator in telangana and andhrapradhesh every place I got high network and now airtel invited 4g network it has awesome speed in my village only 2g signal was available by all network but airtel provided high internet speed with 3g speed
2g speed -> download speed 25kbps to 45kbps
3g speed -> 250kbps to 800kbps
airtel network is better then all