WiFi Calling: Some WiFi connections may not support WiFi Calling .
Optus WiFi Talk: The Fair Go policy applies to your use of the app. WiFi Talk is free to download for Optus mobile customers. Some functions in the app may use data when roaming. You will be charged your usual mobile plan rates for making calls or sending texts whether over the mobile network or over WiFi Talk. To use the service, you will need to have a valid Optus mobile phone number and access to a WiFi connection. Some public and corporate WiFi connections may have specific firewalls and settings that might mean WiFi Talk won’t work. We cannot guarantee each specific WiFi connection will allow access to the app. Emergency calls are supported via WiFi Talk if there is no mobile network available however we recommend that you use your normal phone service in an emergency to provide a more accurate location to the emergency services. WiFi Talk has features that measure your network experience including signal strength and network speed. You can switch this setting off via the settings/options menu. Full terms and conditions are available in the App.