Well I have been using Jio sim since past a year it’s internet speed is too good sometimes it reaches till 4-5 mbps mostly there’s no problem in network they have provided data calling etc totally free for nearly a year and now also after prime membership just in 309 rs they provided unlimited calling and 1 gb / day for three months
Bad side
Sometimes there is a network problem and you are not able to connect a call
Due to heavy traffic data speeds gets to low which is nearly about 10-50 kbps
Overall the Jio sim is worth of buying