I think 4G will take more time due to liberalization and JIO Sharing. But I thought 3G was possible if we chose AIRCEL manually. But even that is not happening. Network is only connecting to Reliance and TATA. Both have only 2G in Tamil Nadu.
Another strange thing, used 2G & 3G (on Aircel) data for around 50 MB but data balance remains at 9216 MB.
Still not be able to latch on their 4G network.