Yes, Jio Phone 2 does support the Tamil language.
Yes, Jio Phone 2 does have the support for the Oriya language.
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 comes with a pre-loaded YouTube application. You can use YouTube in Jio Phone 2.
No. You cannot use the 3G network on Jio Phone 2. You can use the 4G network and 2G network.