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.
No. You cannot use the 3G network on Jio Phone 2. You can use the 4G network and 2G network.
Yes, Jio Phone 2 does have the rear camera flash.