Credit Cards
Walmart MasterCard Customer Service 1-888-331-6133 To Activate Card 1-888-779-2977 Report Lost or Stolen Card 1-888-925-6218 TTY 1-877-763-0997 Hours of Operation Monday-Saturday: 8am-10pm (EST) Sunday: 10am-9pm (EST) Mailing Address Walmart Rewards Mastercard P.O....
