All of these devices support WiFi Calling if they are bought directly from us. If you are using a device that was bought from another network, or SIM free, we cannot guarantee that it will support our WiFi Calling service. If your supported device doesn’t have the WiFi Calling option available, make sure you have updated the software to the latest version and reboot your device.
If your device isn’t supported yet don’t panic, we’ll be adding WiFi Calling to more devices soon.
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Seems you'll be waiting a long time (like the rest of us). Virgin are only interested in the minority iOS & just 1 Android phone. The fact that Android is by far the most widely used OS worldwide is one completely lost on Virgin Media.
I think you will find that enabling it for iOS is a one off job and all iPhones will work. Android is different due to the multiple setups for the different manufacturers and because some Androids need software from the network in them to get WiFi calling to work.