Vonage has rolled out apps for Android and the iPhone that allows users to make free domestic and international calls to nay of the Facebookfriends.

The app has been termed as Vonage Mobile app for Facebook, come free for smartphones based on iOS or Android.

One only needs to log in to a Facebook account and then shall be asked for what information you want to allow your friends access to.

At that instant one needs to get the message as: "Less than 5 of your friends have Vonage mobile for Facebook."

It gives an opportunity to offer calls and at the same time invite more users for the same.

Calls can be made over Wi-Fi or 3G, although 3G will take up minutes. The Wi-Fi bound calls are free, and will save you minutes.

The service provider, Vonage claims that it will soon be offering low-priced text messaging in the kitty.