Reliance jio launched with great ideas and aim and everyone surprised to see its free offer.it gave pre offer for some users and after it they gave awelcome offer for every 4g mobile users.i am also a 4g mobile user and I am using jio sim last one month and I am using this free services but it is giving some issue in calling and internet.almost my many calls has dropped and its internet speed is very slow, sometimes it gives speed in mbps and almost all time it gives speed in kbps in my mobile.but this is a free servise so it can not be very bad.so jio sim and sevices is almost nice and good but not best for me.