No. You cannot use the 3G network on Jio Phone 2. You can use the 4G network and 2G network.
Yes, Jio Phone 2 comes with JioTV app. You can watch 400+ TV channels live.
Yes, Jio Phone 2 does support the Bengali language.
Yes, Jio Phone 2 does support the Malayalam language.
Yes, you can use WhatsApp in Jio Phone 2.