To enable the feature in iOS, open up Settings then tap Phone and Wi-Fi Calling. On an Android phone, go to Settings then choose Network & Internet, then Wi-Fi, then Wi-Fi preferences: Tap.. Possible cause 5: Poor or no network coverage: Try again later when you're in an area with better network coverage.View our network coverage map.If you have broadband at home and can't access your network try using WiFi Talk, which lets you make and receive calls and SMS using your Optus mobile number over a Wi-Fi connection.

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Android. Using WiFi Calling when there's no coverage available. I can't make/receive calls. I'm always on the 3G network/poor quality calls. I can't get reception/my phone is in SOS mode. My internet speed is slow/I can't connect. I can't connect to the 5G network. Have a problem with your phone? We'll walk you through common mobile.. Optus 3G Dual band service is part of the Optus Network and refers to our 3G 2100MHz/900MHz coverage. You will require a 3G 2100Mhz/900Mhz compatible device to access the 3G Dual band coverage. For example hills, concrete structures, high-rise buildings, lifts, basements and tunnels may prevent or interfere with reception. 4. Optus' coverage.