thetechfreak, airtel told me its at 2G rates.
i had 3G on a 2G sim using 2G rates (1Gb @ 48 for 10days) for almost 3 months. but once tried for unlimited free 3G. trick failed & 3G was dead
I was using BSNL's 3G by recharging for Rs. 98 for one month internet usage for 3 months when they launched in my city(South Tamil Nadu). And I thought they were ignorant. Then I realized that it was just a Marketing Strategy. They 'unknowingly' let you get used to something at cheap rates/free, make you 'feel' smart, and then they change their rules. You end up hooked to the thing, and can't let go of it. Thats how they "fleece our guts".
An example, but off-topic

oCoMo offered the cheapest call rates, and they claimed that missed call alerts ought to be free, and it was crime to charge for the service. Now, without notice, everything's changed. Nothing is free or cheap in DoCoMo anymore. Yet, I can't change their service inspite of their poor network coverage. I'm hooked up to it I guess.