Yes the jio 4g voice doesnt work in the redmj phones and I dint know why because and I tried it soo many times that application is now not installing in my phone only I dont know what problem they have with their applications most of them if they work also they wont work properly the next time so its better calling normally and even the way the application shuts down sometimes without any knowledge and all the data will be erased so I think its a waste of time that you will download and afterwarda you will regret it.