Level 1: Cadet

Wi-fi Calling on Sony xperria Z5

I have tried to locate the option to turn on Wi-fi calling on my Sony xperia Z5. My phone does not appear to have the option despite finding many guides on where to locate it on the phone. We are in a remote area with no mobile signal but have fixed line ADSL. Is there a software update I need on the phone to be able to activate it?



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