I have had a Google Voice account for several months now. When I first set it up, I picked a phone number to assign to it. However, no one calls me on that number. The only calls I get are to my cell. How can I setup Google Voice to replace my Verizon voicemail, and my Verizon VVM? I have the app installed on my phone. However, I am unable to find any options to authorize it to answer my voicemail.