Today, Vonage launched Vonage Mobile application for Facebook: A new service which allows users to make free mobile calls to all of their Facebook friends who have the app as well. That's a bit of a stumbling block since your friends need the app installed to make VoIP calls. Although, you can IM them from within the free app regardless of whether they have the Vonage app installed. But once installed by both parties, it can be convenient to make free calls to any of your Facebook friends, especially since you can see when they are "online" (presence).

The app is available today for free download from the Android Market in 48 countries and from the iTunes Store in 87 countries. It can also be downloaded here: vonage.com/talkfree. It is available for iPhone, iPod touch and Android devices. The service works over Wi-Fi and 3G /4G networks in most countries. When you make a call, the friend's profile picture and status update display on the screen.

How does the Vonage Mobile Application for Facebook work?

• Downloads the app from the iTunes Store, Android Market, the Vonage fan page on Facebook or vonage.com/talkfree.
• Enters Facebook ID and password (one time only).
• Views Facebook contacts after they are automatically loaded. They'll be grouped by friends who can be called for free and friends available for instant messaging on Facebook. A Vonage logo will appear next to the names of friends who have downloaded the app.
• Invites additional Facebook friends to get the app at the Vonage Fan Page on Facebook or vonage.com/talkfree.
• Touches a friend's name from the Call Free list to make a free call anywhere in the world; no need to be online.
• Rings the phone for incoming calls, even if the application is closed. (via Push Notifications)

Check out the video for more: