Hello Dear,
currently I am using Reliance Jio sim card. It is amaging internet surfing experience. Seriously it is unbelievable 4G service providing by the Reliance Jio. Specially when you download some large files it takes very short time to do the activity done And about the voice call its completely free of charge whether you make local call or national. Sometime you feel network problem but if you ignore them you will really have great experience. Presently its completely free of any charge till the month end of march 2017. So enjoy with Jio. God Bless!