Recently I purchased a 4G mobile which support Reliance Jio SIM .
Jio offers free calling and free data till december 31 2016.
Data speed is very good , we can watch videos online without buffering, we can do online shopping faster at festival season. Download speed is good.
Coming to calling the voice calls are rich and clear. Sometimes it connects lately to some networks.
Everything else it is fine and a must have SIM to everyone who loves internet for browsing shopping watching movies etc.
Go for it .hurry up asap