Facebook’s free voice calling service has begun rolling out to users in the U.S. after a trial in Canada that began earlier this month.

As first reported by The Verge, voice calling will be made available to U.S. users with the latest version of Messenger for iOS starting today and will gradually be brought to more users.

Users can call their friends — who also need the latest version of Messenger for iOS and to be part of the initial test group — by tapping the “i” icon in the top right of the screen when messaging a friend and then tap “Free call.”

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