I haven't tried JIO but at least the 3 new Lumia's have all bands (including b40 - 2300 mhz) covered , Lumia 650, 950 and 950XL, but 550 has limited 4G bands.
Someone on another forum was complaining Lumia 950 doesn't have VoLTE enabled in India models (which dual sim unlocked versions) though it's "possible" because the other models which are carrier-branded are working (in other countries).