To make a MasterCard balance inquiry, call the MasterCard Assistance Center at 800-627-8372, or log on to the website provided by your individual MasterCard provider. If you have a PIN number associated with your card, you can also perform a balance inquiry at an ATM.
The phone number associated with your account is usually printed on the back of your card and listed on your monthly billing statements. Keep in mind that phone call inquiries and online inquiries are usually free. If you make a balance inquiry at an ATM, you may be charged a fee by your MasterCard provider and the ATM provider.