Yes, Jio Phone 2 does support the Bengali language.
Yes, Jio Phone 2 comes with a pre-loaded YouTube application. You can use YouTube in Jio Phone 2.
No. You can use Instagram website but you cannot use the Instagram App on Jio Phone 2.
Yes, Jio Phone 2 does support the Punjabi language.
Jio Phone 2 does have the 4GB internal memory. Practically, it has unlimited contact book.