I just enabled 3G for my number...
I thought I may have to change my sim. But converting from 2G to 3G was as simple as sending an SMS. Yes, one SMS, that's all. 5 minutes later, I was on 3G network!
I assumed that there would be some special settings to access internet from 3G network. It turns out that the same old GPRS settings work. FYI, here's the connection settings:
Access point name: gprssouth.cellone.in
The internet connection on 3G is very fast. I could easily get speeds of over 100kbps. The cost is also about 1/10th of the gprs connection.
In fact, I'm writing this blog post from my phone. :-)