Right now I am in Amrita University, Vallikavu, Kerala and I am able to use both data and Voice/SMS simultaneously!! I am really happy. This means, it is actually supported.
But what I wonder is, If the is available in a small village like Vallikavu, why not in Bangalore!!!
The simultaneous support for voice and data has never been there on Airtel and Vodafone. I have earlier used both Vodafone and Airtel in Bangalore on multiple phones but then neither have ever supported simultaneous use of the two.
I am really happy. This means, it is actually supported.