Facebook has rolled out video calling on its Messenger app to more countries around the world, following the introduction of the feature in 18 countries last month.

“We’re happy to share we’ve now rolled out the capability globally, with the exception of a few countries we’re still working on improving quality for,” David Marcus, vice president of messaging products, announced in a Facebook post today. “So make sure you get the latest and greatest version for iOS and Android, give it a try, and as always… tell us how we can make it even better for you!”

In addition to working on iOS and Android, video calling also works on the Messenger website, messenger.com.

Marcus told a Facebook user in a comment on today’s post that Facebook “would love to offer the service in UAE, but operators are blocking it.” It’s not clear which other countries Facebook doesn’t yet support for free video calling in Messenger.

The expansion of video calling in Messenger follows the introduction of free voice calling to Facebook’s other messaging app, WhatsApp.

Messenger had more than 600 million monthly active users at the end of March.