What is a horizon phone? Horizon is a hosted business telephone service that utilises cloud technology to provide a wide range of fixed and mobile telephony capabilities. A user-friendly web portal ensures that the administrator can manage the system easily, while also maximising employees productivity. One of the main goals of the Horizon hosted system is to provide businesses with a platform that they can manage and customise based on their requirements.What is horizon phone service? Horizon Hosted phone system. Horizon is a complete hosted communications service that provides businesses with an extensive range of fixed and mobile telephony capabilities via an easy-to-use web portal.What is horizon communication? Horizon Communication Group is an integrated communications consultancy with offices in Sydney, Melbourne and Brisbane and network affiliations throughout Australia and Asia-Pacific.