Wi-Fi Calling is a technology that lets you make and receive calls over a WiFi connection instead of the regular cellular connection. Wi-Fi Calling on your iPhone can be helpful in areas with little or no cellular coverage.

Let’s see how you can enable Wi-Fi calling on your iPhone.

AT&T finally activated Wi-Fi calling on its network, allowing iPhone users to seamlessly switch to their local wireless network to place calls when their LTE signal is weak.

Apple added WiFi Calling in iOS 8, but you probably haven’t had a chance to use it yet because the only carrier in the U.S. to support it has been T-Mobile. Now that the nation’s second-largest carrier is getting on board, more iPhone users than ever can take advantage of the feature to place calls anywhere in the United States, free of charge.

Here’s how to turn it on: