With the discontinuation of popular validity extension plans like ₹44 (Deepam) and ₹49(Mithram) which offered 180 days validity, the minimum spend to extend validity is ₹74 for 90 days. It is bundled with some data and call benefits which has a validity of 15 days.
Now the minimum spend per month (28 days) has come to ₹23 from just ₹7.