Google Voice + MyFaves = Unlimited Calling?

While driving, I was thinking... what if you could add your google voice account to your myfaves/friends and family (verizon)? You would have unlimited free calls! In theory, this works great, since techinically google voice calls your mobile #, then connects you to the caller. So I did a little googling to see if this topic was ever brought up with Grand Central (the company google bought to turn into Google Voice), and of course, there have been discussions about this already. So after checking out a few sites and this forum, the conclusion is, Tmobile hasn't taken any action yet, but according to the terms of service for MyFaves

*Your five numbers must be US domestic numbers and must not include 411, voicemail, toll-free, 900, calling card, and customers' own numbers; and single numbers allowing access to 500 or more persons.

Your google voice number is your own number, but how would they know? I have not tried this personally, and do not condone others to do so (disclaimer: I am not held responsible for the consequences of this hack). For those that have, does this actually work and has Tmo taken action on anyone? I'm guessing Tmo will crack down on Google Voice numbers in the future somehow by getting a list of all the Google Voice #s and comparing it to people's MyFaves. Only time will tell...

Edit: Just checked in Twitter, it has been done.