Airtel provides the best 3G network coverage and speeds in Delhi. Another interesting thing is that, as of now in the roll out phase, 4G services can be availed at 3G prices!
This means all the devices which support 4G LTE can get 4G data at same price as 3G.Now, talking about the network, 4G is working very well in mostly all regions of Delhi.
I’ve used 4G on my One plus one, and it’s working fabulous. I’ve been getting speed up to 25 Mbps download speed constantly without any downtime. I only lost the network for 15 minutes in the evening, but since then has been doing very consistent. Also, sometimes it may take a few minutes to switch from 3G to 4G depending upon the signal strength. Occasionally it may even require a reboot, but it’s a rare case.The 4g service currently provided by Airtel is TD-LTE, which will work on any device that supports 2300Mhz band 40.