I had jio sim on slot 1 of my phone, the 2nd sim had vodafone sim. Ever since i had my jio sim on my phone i had a strange behavior on my phone, My calls on vodafone breaks and disconnects while i am at home, while i am at office i get echo of my own voice and not the other end I have to end the call and call again multiple times. The best point to be noted here is I have inbuilding booster at my home and at office and my signal is always full. I complained vodafone they said there is good coverage at my home and office. recently after the jio offer ended i switched off my jio sim and put my vodafone sim on slot 1 of my vodafone. Now all my call issues go rectified, is this something jio sim created i dont know .your opnions :u