Since RoboKiller and Google Voice use a feature called Conditional Call Forwarding, you won't be able to activate both on your device. However, we have the ability to forward your calls from RoboKiller to Google Voice instead of your normal voicemail. To do so, all we need is your Google Voice number. Once retrieved, please email email@example.com so we can set up your RoboKiller account to forward calls to Google Voice.
Please note, the only carriers which reliably support Conditional Call Forwarding at the moment are AT&T and T-Mobile. For all other carriers, the most reliable option would be to receive voicemail through RoboKiller.