After receiving the ICICI Bank credit card, debit card through post , one needs to generate PIN by going through the instructions given in the leaflet or follow the steps provided below.

Debit Card: How to generate 4 digit pin at ATM - Check full procedure Having a debit card pin is must, because that’s the only security code used when you are carrying ATM transactions.

If this happens, you may want to log onto your bank's website (assuming you haven't forgotten your password) and see if you can reset your debit card PIN there.