You can now call your Facebook friends on your iPhone or your Android device. This is made possible by a new app from Vonage, called Vonage Mobile for Facebook, which offers free calls to all your Facebook friends who, virally, have downloaded & installed the same app on their device. The calls work over WiFi and 3G/4G networks.

The app trolls your Facebook profile for compatible friends and shows you whether they are able to either take voice calls or chat. Regular updates keep reminding you to pass the message round to your friends about the service via Facebook, so as to complete the circle of Vonage connected-ness.

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