After launching its free voice calling option for its Facebook Messenger app earlier this year in the United States and Canada, Facebook has has quietly rolled out the same service for its UK users. The new calling feature for UK users is built into the iOS Facebook Messenger app and if one of your contacts is online and capable of receiving a voice call you can now easily make a call.
All you have to do to initiate a call is tap on the “i” in the top right corner of the conversation view within the Facebook Messenger app and the contacts information page will be presented with the option of making a free call. Once you have clicked Free Call, you can then talk to your hearts content over WiFi or with your existing data plan. You can find a full how to guide right here.
Facebook hasn't officially announced that this service is available in the UK or released an update to its app to enable it; it just appeared without any fanfare at all. There has also been no mention if this service is set to continue to roll out throughout other parts or Europe; but we assume that it will in the near future. If you notice Facebook Messenger offering the ability to make voce calls in your country, let us know in the comments.
Source: The Verge