Have a Telstra approved Wi-Fi Calling compatible device. Have VoLTE (i.e. 4G Voice Calls) enabled on your device. Ensure you have updated to the latest software. Turn on Wi-Fi Calling in your settings on your device. Aug 28, 2018 · How to make WhatsApp group voice and video calls With Knock Knock, you can see a live video of your caller before you answer. The app is easy to use, too, because its interface is ridiculously simple.
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