Access Effective Assistance by Dialing Telstra phone number (1-800-431-401). At our customer service centre, the entire assistance procedure is efficient and centered on phone conversations. But it is our years of expertise and skilled team members that have a thorough understanding of how to use cutting-edge equipment and their skill sets that distinguish our service. If we start with how we can help, we can ensure that we will provide unrivalled services at affordable pricing.