Yeah, I've been meaning to give that a look. We already use Google Voice for our "land line" via an Obi110 adapter, so it shouldn't be much of a change, other than using a new app to dial out. I really like the integrated nature of T-Mo's wifi calling with the regular dialer, which is why it's disappointing that it seems to use minutes. So instead of something that could give them a competitive advantage at relatively little cost, it's just another carrier money grab.