Reliance Jio is a 4g network and support only on 4g phone but sometimes the speed on the sim is worst than 2g sim. Recently telenor has launched 4g service in kanpur and Telenor 2g gives amazing speed on the other hand 4g speed is Min 2-4Mb/sec but in Jio sim we never seen speed more than 600kbps sometime it across the criteria of 1Mbps.
Calling on Jio is like third party internet call because from some few days we had noticed on jio network calling with Jio4g calling app Eco of the voice of the Speaker is reflect after talk.