Google phone number on Android phone with no cell service?

Is there a way to use a Google phone number on an android phone that does not have cell service. I can connect to the internet through WIFi. I tried using Google voice but it wants me to turn the cell portion on (I have it off to save power). It did try turning it on but it says the phone has no service (which I already know)|||You can use Groove IP to make Google Voice calls over WiFi.