I I have my mi max prime with reliance jio preview offer at chattisgarh.still using from 10 days it gives me 4g service which is near 3mbps and also voice call is so amazing.the clarity of voice calling is too good even if network is down.
The jio tv and jio cinema is also lag free ther is no buffering on this app.when you play the video it start continously. That is so good also the volte enable function is rock for video call. Overall it is very good as compare to other network bcoz at this time if you buying any other network operators you will give them rupees for data but in preview offer you will not have to pay anything and after announcing its plan it is too low cost and also voice calling roaming and sms is free for lifetime that is so amazing