Do you use Facebook's Messenger app? You can now make free calls if you have an iPhone. Android phone owners are out of luck for now.

As first reported by The Verge, Facebook is rolling out a free calling feature in its Messenger app for the iPhone. The feature, which was released in Canada a few weeks ago, lets iPhone users make free calls to other iPhone users who are using the Messenger app. You can't call landline or cellphone numbers.

The update will begin rolling out today in the Messenger app. In the app, select a friend, then the “i” icon in the upper right hand corner, and you will then see a “Free Call” option. Facebook confirmed to ABC News that users will not have to update the app for this feature; it will automatically appear for those who already have the app. As with Skype or other mobile VoIP (Voice over Internet Protocol) services, you can make the calls over Wi-Fi or a 3G, 4G or LTE connection. Wi-Fi is the cheaper option; if you are on a cellular network it will eat at your data plan.