AT&T is bringing Wi-Fi calling to Android devices, starting first with LG's G4. The company introduced the feature for iOS devices last October, and starting today you can make calls and send and receive texts over Wi-Fi so long as you own LG's 2015 flagship and install the requisite software update. AT&T says it plans to add more Android devices soon. The feature works by detecting when you're in an area with limited cell coverage and connected to a Wi-Fi network. From there, you can use your phone for calls and texts just as you would normally.
Wi-Fi calling has a few other limitations right now. It only works for AT&T customers in the US, Puerto Rico, the Virgin Islands, and select international countries. If you call a domestic number over Wi-Fi, you won't incur any charges. But you will have to pay standard international rates if you call an international number. You also need to have a post-paid wireless account, so pay-as-you-go customers are out of luck.