Well I tried to install it and said my service provider won't support it.
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i think this is the popup that appears saying that automatic voice mail setup is not supported by the carrier. meaning if people calls your Verizon number and you don't pick up, it will forward it to Google Voice so you can use their Voice app for visual voice mail. i think this is the setup that popup is talking about.
i'm not sure if Verizon has a feature to forward to a different number if you don't pick up the phone, but if you use your Google Voice exclusively anyways, it doesn't matter.