We’ve been with Tierzero for our phone and fax services for over 10 years, and our experience has been consistently excellent. The service itself is very reliable we’ve never encountered any major issues, which is incredibly important for a busy medical office like ours. What truly stands out is their customer support. Every time we call, our concerns are handled promptly, professionally, and with genuine care. Their team clearly knows their product inside and out, which makes troubleshooting and resolving issues seamless. I somehow always end up with Rathany when I call lucky for me, and he is amazing. It genuinely feels like he knows who you are, which makes the experience even better. It’s such a great feeling to call a company and feel recognized — it really shows how much they value their clients. He always takes the time to listen, ensures our concerns are fully addressed, and never makes us feel rushed. It’s rare to find a company that combines dependable service, strong product knowledge, and exceptional, personalized support so seamlessly. We highly recommend Tierzero.

Our company is pretty large and we rely heavily on stable internet, phone systems, and network infrastructure to keep everything running smoothly. Tierzero handles our business internet, voice systems, and managed network services, and honestly over the span of 5 years we NEVER have issues — only the occasional question. That kind of reliability is huge when you’re running a big operation. I spoke with Rathany today and he was fantastic — super knowledgeable, upbeat, and genuinely helpful. He took the time to answer my questions and made everything simple and straightforward, which I really appreciated. Tierzero has been incredibly dependable for our business. Their systems run smoothly and the support is excellent when you need it. If your business depends on strong connectivity and reliable network solutions and you’re not working with them, you should seriously be asking why. I can’t recommend enough..

We've been using Tierzero for more than twenty years now and I'm genuinely impressed with their service. The coverage is reliable and consistent and never had a downtime. Their customer support team is friendly, responsive, and always ready to assist with any questions or issues. I also appreciate their flexible plans and clear billing system, which make managing our services simple and stress-free. Overall, Tierzero provides an excellent value and a seamless communication experience! Highly recommended! Shout out to John Carter, Mike Gach, Hans Offer, Rathany Suon, Jesus Salas, Susan Chung, and the rest of the team! You are the best! Thank you for providing exemplary service throughout the years!

We have been a Tier Zero VOIP customer for 20+ years and have always been impressed with their customer service. We rarely have issues, but when we have questions they are extremely responsive and professional in their resolution. Additionally, they're entire team, including support, is located in Southern California. Having U.S. based support is another main reason we stay with them. I would highly recommend Tier Zero as a VOIP provider to anyone who asks.

I've been a client as well as trusted partner of Tier Zero for the better part of 20 years. Happy to refer them to new potential clients as we share many and they are hands down one of the best VoIP and ISP vendors I've worked with professionally and their support is unmatched in the space! You can get to L2 technician without being put on hold and hung up on twice.