Right, but what if the network began supporting it? My understanding was that even if turned on, the current device still relies on either CDMA or HSPA/whatever for voice no matter what.

I dont think it's clear yet; changes to the network may only require a change in software to get this VoLTE function. The document suggests Verizon is testing this, but where did he get that info? There is no footnote about it. Also, would the phone even support it?