All plans are changed pro-rated, they would be done within the billing cycle, you WILL have to call them, airtel is notorious for "grandfathering" customers on older plans that don't have them changed. Also, knowing airtel they will reset your data usage to the new 150GB irrespective if there is only a day left in the billing cycle, they only pro rate the amount, but, give full data for new plan.wow great. I am on 899 (60GB Plan). I wonder if it will be changed to 150Gb from next billing cycle or I would have to call them to change plan?
Also, what will happen to the Bonus Data (500Gb), I still have 280GB left. I guess they will probably remove it if I ask them for the plan change?
Bonus data is getting carried forward, which is a surprise (good way) considering its airtel we are talking about.