How can I set my own PIN for my new debit card? In a separate mailing from your debit card, you will receive a notice informing you of the personal identification number (PIN) assigned to your card. You can set up your PIN when you call to activate your debit card, call us at 800-328-1935 or change it online on the ATM & Debit Card Services page of Alliant Online Banking (under the Settings tab).