That depends on what type of phone system you have: If you’re using a traditional, on-prem phone system, one you maintain in office using onsite PBX, than the average lifespan of a phone system is between five to seven years. But a cloud-based (VoIP) phone system can be used forever. There's no hardware that needs fixing or maintaining. The system’s equipment and software are managed and maintained by the VoIP phone system provider, not you! That means you always have the latest technology, features, and applications – and you can rely on it for decades to come.