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Credit Card Customer Service

Call: 866-820-3947

Credit Card Activation

Call: 800-631-3197

Lost or Stolen Credit Card

Call: 866-820-3947
Within the United States
24 hours a day, 7 days a week

Call: 00 + 1 + 314-542-7111
Call collect from anywhere globally

Credit Card Payment Mailing Address

Mastercard®
P.O. Box 37603
Philadelphia, PA 19101-0603