Jio is the first telecom operator to introduce Voice over LTE in India. It provides the best call quality and internet speeds than compared to the other incumbent network providers. Call connects faster than in other networks. Only problem I found is the lack of connectivity abroad. They are yet to launch international roaming facility. Network speed has also dropped in some regions due to tower upgrades. Regardless of these few setbacks, they are the best in terms of the technology they deploy. Hope it continues to be the same in future.