Best Buy Customer Service Phone Numbers Customer service: 1-866-237-8289 GSP Service Plan or GSP Replacement Plan: 1-800-433-5778 Accessibility: 1 (800) 663-2275   Best Buy Headquarters Info, Email, Phone number, Website and live chat Information Founded: August 22, 1966; 51 years ago in St. Paul, Minnesota, U.S. Founder: Richard M. Schulze Headquarters: Richfield, Minnesota United States   Best