Wi-Fi Calling From T-Mobile

I’ve written in the past about my desire for Google Voice to provide voice over IP capability on Android phones. The reason why I desire the capability is that I don’t have good T-Mobile coverage in the basement of my condo, which is where my home office is located. Ideally, I would like the Google Voice app on Android to work just like the voice chat service that Google recently added to Gmail, allowing users to make and receive phone calls using your Google Voice number.