Facebook has been testing free calling over Wi-Fi and cellular data, and the service has been available to iPhone users in Canada for some time. Now the service has reached iPhone users in the US as well. It is available through the Facebook messaging app. As of now, the service is restricted to the US and to iPhone users and there is no information on when the service will hit Android or Windows Phone devices in the US or when the service will be available globally.

 

Making a voice call to another Facebook user is quite simple. Users need to open a conversation with a friend, tap the "i" button in the top-right corner, and hit the Free Call button. The call recipient will then get a notification that a Facebook user is trying to call them.

The service is a very nice addition to the messaging app. This means that you can make free calls without making your cellular bill go up. If you have a great data plan, you can make calls via cellular data and save your phone bill. Facebook was testing VoIP calling and voce messaging via its messaging app in January. Facebook yesterday announced the new Graph Search engine on its social networking website, making search results more relevant to you on a social scale. Data accumulated from user profiles over the years make results closer to you and your friend's circle.