Telstra added a number of new phones to its list of compatible devices on May 10, 2017. For the updated list, follow this link.
Telstra is progressively deploying Wi-Fi Calling - also known as "Voice over Wi-Fi" to all mobile customers with a compatible device and a fixed-line broadband connection.
Wi-Fi Calling technology is designed to let people make and receive phone calls over their household Wi-Fi networks, to help address situations where one may live in a mobile blackspot or not have cellular coverage in certain parts of their home.
Telstra mobile customers who also have a Telstra fixed-line broadband connection will be able to use Wi-Fi Calling without eating into their home broadband data allowance.
Telstra Wi-Fi Calling will only kick in when there's insufficient network coverage to make or receive a phone call. Notably, if you've got Wi-Fi Calling enabled, your phone will be able seamlessly handover from cellular to Wi-Fi (or vice-versa) when coverage is insufficient. Wi-Fi Calling only works with calls, SMS and MMS messages still require a 3G or 4G connection.
At present, Samsung's Galaxy S6 Edge is the only smartphone that works with Telstra Wi-Fi Calling. Telstra also says that you'll need either a Telstra Gateway modem or a modem that is less than four years old for Wi-Fi Calling to work.
If you've got a Galaxy S6 Edge, Telstra Wi-Fi Calling is available, and you're in a Wi-Fi coverage area, you’ll see the icon for Telstra Wi-Fi Calling in the status bar next to your Wi-Fi signal strength indicator. Wi-Fi calling can be enabled and disabled in the dialler app's settings.