We're Here to Help
Existing customers, get the support you need. Our US-based team is available 24/7 to assist with technical issues, billing questions, and account management.
Support Hours
24 hours a day, 7 days a week
Support FAQ
Quick answers to common support questions
Call our support line at (213) 784-1397 for immediate assistance. Our team monitors network health 24/7 and will work to restore service as quickly as possible.
Log in to the My Bill portal at account.tierzero.com. You can view invoices, set up autopay, and manage payment methods.
Access the My Phone portal at core.tierzero.net/portal to manage call routing, voicemail, extensions, and other phone settings.
Our US-based support team is available 24 hours a day, 7 days a week. Call (213) 784-1397 or email care@tierzero.com anytime.
Contact our sales team at (213) 784-1400 or sales@tierzero.com to discuss upgrade options. We'll assess your needs and recommend the best solution.
For user management on phone systems, log into the My Phone portal. For billing changes, contact care@tierzero.com or call (213) 784-1397.