Call customer service at 1-877-844-4999, TTY 711, 24 hours a day, 7 days a week. Call us 24 hours a day, 7 days a week with any website or technical questions or issues. If you're a UnitedHealthcare Oxford member, call 1-800-444-6222, TTY 711, 8 AM - 6 PM ET Monday - Friday. Accessibility Statement for Individuals with Disabilities..