Facebook has been on a real push to take over users' phones as of late, with Facebook Home, Chat Heads, and updates to its official and Messenger apps. Today, it goes a step further, offering full, free voice calls to US users. This is the same feature that rolled out to Canadian users late last month.

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The service requires Facebook Messenger to be installed (naturally) – to initiate a call, simply head into your contact list, open a message, and hit the "I" in the top-right corner. You should see an option for "Free Call" in the list; if it's white, the users can receive a call. If it's gray, then your friend can't receive calls. Simple enough.

This new feature doesn't require an app update and should be rolling out to users now.

via The Verge