Maybe Devesh is about 3G video calling (3G-324M protocol)?
It is still used in some countries and is still available in some Android phones from other manufacturers. It is not an option in pure Android phones.
3G features has become less relevant since most phone manufacturers and network operators now focus on LTE development.
Hi again Devesh,
As far as I can figure out, video calling in Jio's network requires the JioChat: HD Video Call app from Reliance - and it only works when other users have the same app installed.
I'm in Denmark and don't know how it worked previously.
You may get better answers if you post the question in the forum section for the specific Nokia phone. If it's a popular phone model in India, then there is also a good chance others are facing the same issue.
There is nothing the forum can do to help when a service provider decide to change or discontinue a service.