Hi, I live in the city fringe and do not have any optus 4G/ 3G coverage inside the house. Till recently I have been using wifi talk app installed on my nexus 5x which used to be my way to a phone network. On 24th sep 2018 optus discontinued with the wifi talk app. Optus offers wifi calling on a very limited mobile phones. Apple and Samsung. Currently I dont have any service inside house. what are my option as a consumer? Belong/Telstra has a good network coverage inside house. When I spoke to technical support they told me i dont have any choice but to cancel my service as they cant do anything. Is this So?