"Your operator doesn't support disabling call forwarding when your phone doesn't answer"

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http://forums.androidcentral.com – Been trying to setup Google Voice as my voicemail on my new Nexus 4. Originally I thought maybe I had to forward when unanswered to my Google Voice number. Then I found the Google Voice app, installed it, and configured my voicemail settings to use GV instead of My Carrier. I set up a message and everything. I've had my gf call my phone a few times and usually it goes to some "this customer could not be reached" boilerplate response, and I think it might be because I'm forwarding unanswered calls to this GV number. I try to disable this feature and I get the message in the thread (HowTos)