Another of Mtnl Delhi’s STV which still won’t help them gain customers given the condition of their mobile network.

Plan STV MRP Rs.425
1 GB of 2G/3G data free per day
Free voice calls on MTNL Delhi & Mumbai
Free 25 minutes per day on other network (15 local + 10 STD minutes)
Beyond free minutes only 25 paisa per minute
Validity: 90 days

Do remember Mtnl is 2G/3G network without any plan to launch 4G network.
Better avoid Mtnl services if you need something reliable in case of urgency.