The WiFi will still work for a long time to come. That's the best you can do. There are plenty of apps to call through WiFi. I use Skype for most of my calling.

The WiFi will still work for a long time to come. That's the best you can do. There are plenty of apps to call through WiFi. I use Skype for most of my calling. I only use the cell network when I'm outside the home.