Yes, Jio Phone 2 does have the wifi hotspot.
Yes, Jio Phone 2 is a dual sim mobile phone. You can use 4G sim card slot with the Jio sim and another slot can be used with 2G network sim card.
Yes, Jio Phone 2 does support the Bengali language.
Yes, Jio Phone 2 does have the support for the Oriya language.
No. You cannot use the 3G network on Jio Phone 2. You can use the 4G network and 2G network.