Seems they've introduced Prepaid plans in many more cities now (including chennai).And i find that you can change your plan (within postpaid plans) online itself!!So could some one tell me WHEN (i.e. which date of the month) can i change my plan for..er.. saving money? Because the billing is from the first of every month, whereas the traffic usage is calculated from every 15th...so..???For eg. if i got exams next month, when should i change my plan to get effective savings?(actually i've got exams this month, but its a bit too late to change plans now i guess..)Thanks.