How to setup WiFi calling on any Android device

Update: As some readers have commented below, the Google Hangouts Dialers is the one-stop-shop for everything wifi calling you will need on just about any Android devices.  Released in September of 2015, this app is becoming the default wifi calling for most Android devices.  Combine this app with Google Voice, you will be able to

3 Free Second Phone Number App to Add to Your Android Phone

One smartphone is more than enough to make you feel like a time-poor babysitter, but having the best app for second phone number will extend usability. You must feed it, pay attention to every sound it makes, and keep it safe and protected at all times. So, when you decide that you need a second