3 Months ago I converted my Airtel 3G sim into Airtel 4G as I purchased a new 4G smatphone, I am living in East Delhi and I get very good network coverage and great downloading and uploading speed with downloading speeds up to 50 Mbps to 60 Mbps which are the best speeds as compared to other operator 4G service.
The signal strength is almost 3 bars in my smartphone at most of the places.
Besides the cost of 4G data packs the everything is great. If Airtel reduces the price of Data Packs then it will be the best ISP of telecom operator of the country.
Coming to Service and Support it is great and very helpful they almost resolve the issues on the same day or withing hours.