Hi, I am using Jio. Eventhough I fo not have a genuine 4g hand set I have Lte and I am using Jio through it. For making calls I have to use jipvoice and I am able to make calld without much problems. Sometimes there is break in signal but otherwise it is o.k. Data is really good.Network coverage is good. I have not had any isdues to contact the custpmer care so far. I am on the free data scheme now so I do not know about their tariffs much. On the whole I am quite happy with the operator.