I had galaxy note 3 which has 4g but not VOLTE.and on august I got to know that jio is providing a preview offer for promoting their network so I went to the reliance store and got hands on it.they said I will get unlimited internet, calling and sms.the internet speed was really amazing.but as my phone doesnt have volte, I had to use jiojoin.and the thing was the calling experience was worst, I had to call 3 to 4 times thn only I get the line connect.so I would recommend you to try it if u get for free but if u want it exclusively for calling thn wont recommend it