Before you get too excited, the change is "just a test" and will only be seen by a handful of testers. Facebook has announced that it'll be bringing audio and video calls back to its main app. Before you get too excited, the change is "just a test" and will only be seen by a handful of testers. Audio and video calls switched over to Messenger back in 2014 when it was believed that the app was better off as a standalone app.