Even when you can't get a signal, you can still call and text on your Android phone with WiFi calling. Here's how to easily set it up on your phone.

1. Install a third-party power widget app. I like Extended Controls; Wi-Fi hotspot functionality aside, it’s a cool utility with lots of useful features and customization potential.

It can improve call quality, but Wi-Fi calling can also extend your phone’s battery life, as weak cell signals cause your phone to use more power to boost the connection.