you just need to refill with that trial pack amount.
stop wasting time with CC.
i think it costs 15bucks for 3days... or 27-30bucks for a week.
explore idea web for precise details.
and do this only if your balance is below 50.
they charge 5bucks per MB if you exceed 60MB per day as per FUP.. i never exceeded that amount and i was still being charged. All other aspects were really good about idea GPRS but the wicked charging for usage within FUP was lame.