How do i contact discover card? Phone Contact Numbers. If you need to contact Discover Card for customer service purposes, you can use one of the numbers listed below. Discover Card customer service (US): 1-800-347-2683. Discover Card customer service (outside US): 1-801-902-3100. TDD: 1-800-347-7449.What is the customer service number for discover credit card? Discover Credit Card United States Customer Support Service Phone Number. The customer support phone number of Discover Credit Card United States is 1-800-347-2683, 1-800-347-7449 (Click phone number to call). data-ad-slot="7829909793">. Discover Matrix Customer Service Phone Number.What is the toll free number for discover card? Discover Credit Card United States toll free customer service number : 1-800-347-2683, 1-800-347-7449.How to activate discover credit card? How to Activate Discover Financial credit card using Website?
Every Discover credit card has a specifically prefix like: 6011, 622126-622925, 644-649, 65. Luhn Algorithm Check A Credit Card number must pass the Luhn Algorithm test to see if it is a valid credit card number. Primary Account Number Digits 7 to final number minus 1 indicate the individual account identifier (the last is the checksum).