Airtel offers two prepaid plans for consideration: Rs 489 and Rs 548.The Rs 489 plan includes unlimited voice calling, 600 SMS, and 6GB of data for 77 days.The Rs 548 plan includes unlimited voice calling, 900 SMS, and 7GB of data for 84 days.While the Rs 489 plan is cheaper in terms of average daily cost and total amount, the Rs 548 plan offers a longer validity period.