Just released is a new version of Facebook Messenger for iOS, with beta support for making voice calls (VOIP) on both WiFi and Cellular.
Via MacRumors "To access voice calling, open the Facebook Messenger app, open a chat with someone, and click the 'i' button in the top right corner. If the feature has been activated -- and the other user also has Facebook Messenger for iOS installed -- there should be a "Free Call" button. If it's greyed out, try tapping it anyway. Facebook is rolling out the feature to all users over the next several days."
and via the Verge "What this means is that if you live in the US, you can now call other Facebook users for free over Wi-Fi or using your phone's data connection while you're on the go. When you call someone, a push notification appears on their screen that says "Ellis Hamburger is calling," for example. The feature is especially critical for people with bad cell service at work or at home, and for those who want to conserve cell phone minutes. It's also a huge step for Facebook - which with a single feature emerges as one of the largest communities of VoIP users in the world. Yes, competitors Viber, Vonage, and Skype have had the feature for some time, but all have much smaller user bases."
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