Facebook is rolling out a free Calling option for Facebook users with iPhones. The new option would allow Facebook/iPhone users to connect together with the app with voice calls by tap the “i” button in the top right corner, and press “Free Call” the The recipient would get a notification saying a called is being received. This kind of sounds like a a revamped version of Voxer, where users were able to send voice messages. According to Facebook the calls can only be made over wifi. If your interested in the App, its currently available in Apple’s App store.