Below are the Walmart customer service phone numbers for a variety of consumer needs. 1  Main customer service: 1-800-925-6278. 2  Financial services: 1-877-294-7880. 3  Business card services: 1-877-294-1086.  Gift card services: 1-888-537- 1 5503. Pharmacy refills: 1-800-273-3455.  Find a store near you: 1-800-881-9180.