Google Voice isn't quite VOIP. You would need cellular service (not just internet) to make and receive calls. I can say this from my own experience, my phone service was suspended on T-Mobile for a few days for failure to pay my bill (dont judge ='[ ) but I was still able to make and receive calls via Google Voice. The phone wasn't completely disconnected from the network, I still received a signal to the phone, I just couldn't initialize anything (calls, internet, etc) FROM the phone.