Jio4g voice app is a very irritating app. Those people who don’t have VOLTE in their phone uses this app for calling amd messaging. But this app uses a lot of memory in phone and drain battery and RAM very much. It causes lagging the phone very much. In other hand this application runs only when the data is on. You can’t call or msg anyone without data. The call quallity is not also good as compare to VOLTE. But it can be one option who has no VOLTE.