Jio voice has hd voice it means better voice and clear voice now a days jio is very popular in india and I also use jio 4G sim it only work with 4G mobile, jio 4G voice is best that 3G, the CEO of this company is mukesh ambani.jio is very popular in india and I also use jio 4G sim it only work with 4G mobile, jio 4G voice is best that 3G.