Just checked after a long time and still getting amazing JIO 5G speeds inside my room, even with all windows and the door fully closed due to the AC running.
Only 40C is stable in Mumbai. Jio needs to make band 3 20Mhz everywhere in country somehow. 40C(27SNR), it reaches 280Mbps early morning. This is at 9AM at suburban station. Fully packed station. But noone is using 4G I guess.
Airtel 4G in Maharashtra Circle reaches 300Mbps on 3-40C/1-3-40C. I don't know exactly which combination, because it keeps on switching. Airtel Band 3 itself crosses 180Mbps on 20Mhz in Maharashtra Circle. Jio 4G is poor in Maharashtra Circle.