I am bit hurry while typing down this story. Let's cut it short, for last 3 days I found that JIO's downlink is quite slow, and very much slow whenever I go indoor and Jio LTE moves to LTE1800 or LTE850.
Using the Jio's Netvelocity app, I checked out all three LTE frequencies - Band 40/Band 3/Band 5
Location : Barrackpore
Time : 00:00 to 01:00 am, 2016-09-24