Onenessboy, good to see this..
I would still recommemd people who do this, pick up a prepaid card and not postpaid just to be on the safe side. I know its clearly mentioned about roaming in home networks, etc .... but better safe than sorry!
most people is on unlimited plans use prepaid only.... MTNL unlimited plans are only for prepaid.. i am not sure about post paid... these unlimited plans for prepaid only..
what i found is i am getting better speeds than delhi..while my data card is in roaming....hehehehe...