A new iPhone and Android app, which allows Facebook friends to call each other for free has been unleashed onto the App Store and the Android Market

The Vonage application, which can be downloaded for free, brings your Facebook friends into your phone's contacts book and allows you to call or IM those who have also downloaded the app over Wi-Fi and 3G connections for nowt.

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In essence, it's a VoIP service like Skype, but uses actual phone numbers rather than an online account. The best part is that it works both nationally and internationally, which could eliminate those crushing oversees call rates for good.

We can't see the networks being too happy about this, but we won't be losing any sleep on their behalf. Free phonecalls!

See the video below for the full lowdown:

Link: Vonage (via New York Times)