Aircel 4G on band 40 is available in more cities comparing Airtel 4G in TN circle.. Though Airtel 4G has better coverage, speed in obviously much better in Aircel 4G, especially if the speed test is going to happen at terrace as in their ads.. So to avoid losing the speed fight with Aircel 4G users in TN, they have excluded total TN circle.. Further TN Aircel 4G users can use the not yet opened for public 4G networks of Aircel in AP..