To use VoWi-Fi you need a compatible handset like the Samsung Galaxy S7/Edge. Wi-Fi Calling is supported by inbuilt device technology and is set-up on the device where VoLTE — Voice over LTE (4G) — is enabled. Many modern flagship smartphones support VoLTE – contact Optus if you have issues.
Dennis Wong, acting managing director, Optus Networks, said, “Wi-Fi Calling allows customers to stay connected if mobile coverage is limited when they are out-and-about, at home or in the office but have access to a Wi-Fi connection.
"When Wi-Fi Calling is switched on, the device automatically detects and seamlessly switches to an available Wi-Fi connection to use voice and messaging services. Optus will continue to add other devices and expand the availability of WiFi Calling to more customers.”
Wi-Fi Calling is available to Optus customers across Australia and will operate wherever there is an accessible home or public Wi-Fi service. Visit Optus’ Wi-Fi Calling webpage for more details.