No. Jio Phone 2 does not have the front camera flash.
Yes, Jio Phone 2 does have the Google Assistant in-built.
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 wifi hotspot.
Yes, Jio Phone 2 comes with pre-loaded FM radio. You can even record songs which are broadcasted on FM radio.