I stated that in the initial post. Yes, you could add that number to the F&F IF you have it. I have the 450 min plan so I don't have that. Normally 450 minutes is more than enough for me but when 200 mins are consumed by forwarded calls to my GV number then that kills that plan in a hurry.
The biggest reason why is it always answers. Let me explain if someone calls you and it rings rings and rings and you don't answer it you aren't charged minutes unless you answer.
With google voice you always answer your calls. That voice mail that someone leaves you is taking minutes, and if you dial in to listen to it that costs you minutes as well. Kinda is crazy but makes sense.
Oh, I completely know how it works now and that it ALWAYS answers the phone. I just didn't realize that what "choosing" the google voice as my default voicemail was actually FORWARDING the call. I thought it was tunneling it through the App and going through the data. Had I KNOWN it was going through voice I definitely wouldn't have set it up that way. That's what I get for assuming.
UPDATE: I contacted Verizon and told them what happened and they agreed that since I had discontinued GV voicemail that they would wipe all charges up to today made to that number since it first appeared on my phone and credit me any overage charges. This makes me VERY happy. YAY VERIZON CUSTOMER SERVICE.
Again, for those that can set their GV number on their friend & family list or have unlimited, this doesn't matter but if you are counting minutes, be careful.