Jio 4g voice app is working good but not everywhere. Some areas have high signals and some have low quality. My area didn’t get much signals . So whenever I try to connect a call it says number busy. I have to reconnect 5-6 times to connect a call. It will connect in a single time for only reliance calls. For Airtel, idea and voda users calls cant connect. I think thats the main problem.else it works super . Call will not disconnect between conversation. I think its fine