As I am user of relaince jio sim and I would like to share my experience .
So 4 months before when jio launched their JIO sim with the LYF hanset, I bought it from that time .
At that time the sim only worked with LYF hanset and the speed was mind blowing of from 2 mb to 8 mb.
But now as the user increased, the speed got decrese.
Well the company says they are working on and soon they manage to run it smoothly