Airtel — mobile sim not working in dubai

I have taken a pre paid airtel sim card in hyderabad, india recently and brought to dubai. I am working in dubai and it is always an issue whenever i visit to india. The newly purchased sim is not working and says no service where as i was told it will be operational in all countries. Not sure what is the issue and it has sufficient balance and data package.

Appreciate if we can get my sim card working here in dubai.