Those people who are saying that jio phone is a bad phone they have to remember that the phone price point is very low. it is a good product it is a single sim 4g device. it comes with 4 GB internal storage .the phone is best for the price range .the phone powered by Kai OS which is a simplified version of Firefox OS this makes the phone performance very good. The sound quality of the phone is great. the battery backup of the phone is very good