I tried *71 and my google voice number and it did not go to the voicemail. It just said the call couldn't be connected. I just changed from a LG G5 where it worked on but it has been set up for a couple of years to a Samsung S7. Now I am stuck with Verizon voice which I don't like as well as Google Voicemail.
I assume you dialed *712125551212? (substitute 2125551212 with your actual 10-digit Google Voice number.
Facebook
Twitter
Instagram