Re: Google Wireless WiFi
Republic Wireless has been doing this for several years. Iffy at first but much better now. I bought a Moto X from them and get unlimited calls, text and data (3G)for $25 per month. If you want 4g, it is $35 per month. When at home or anywhere there is a good WIFI signal, all goes over WIFI - automatically. I just log in once and the phone remembers. They have also developed a pretty good hand-off process so that if I am talking on WIFI and move away from the signal, the conversation moves to cell. In my experience, the handoff is not noticeable during the call.
They use the Sprint network for cellular service - I know some that say their coverage is spotty but I have not had any issues in Houston.