Jio 4G Voice is an app that provide jio 4G internet and jio unlimited HD voice calls in that mobiles which not supported jio sim card. Actually Jio voice call and 4G internet require VOLTE supporte 4G smart phone.
But most of people have 3G mobile or 4G LTE mobile which does not supported jio simcard or jio voice call and 4G internet . So Jio 4G Voice application provide HD voice call+ 4G internet for those user who dont have volte smart phone.
As per my experience Jio 4G voice provide awesome HD voice call features and it provide 4G high speed internet for jio users. Jio 4G voice app provide sms fetures that have unlimited storage.
so according to me Jio 4G Voice is cool application.