People's United - Personal Banking
Can I use my M&T debit or ATM card to check my personal account balance?
You can check your account balance at any ATM, using your debit or ATM card.
You can also use your debit card by calling 1-800-724-2440. Select Option 1 “Account Information” at the Main Menu, enter your activated M&T debit card number and debit card PIN.