One of the fastest ways to contact any company is via phone. Oreo phone number for contacting customer service is 855-535-5648. If you need to resolve order issues, call 800-644-9474. Contact the support team via phone to get information about new arrivals, available products, special offers and sales, shipping and payment options, resolve order issues, get help with returns and refunds, and more. Wednesday is the busiest day of the week due to the great number of calls. To save time, avoid calling Oreo on this day of the week.