The official Terracom Wireless phone number is the toll-free number 1-888-716-8880. All calls have to be made to this number. The caller is transferred to the right department or expert who will attend to the caller's problem or request. Queries regarding data top-up, voice top-up, upgrading and replacing phones, and more can be discussed by phone. The number is available Monday through Friday from 9:00 AM to 6:00 PM CST. Customer service is closed on Saturdays, Sundays, and federal holidays.