Facebook Messenger app change allows free calls via WiFi

Using software, rather than hardware, the latest update of Facebook’s Messenger app now lets U.S. users place voice calls over WiFi. The rollout follows reports of Facebook testing voice call features in Canada earlier this month.

via Facebook Messenger app change allows free calls via WiFi – The Washington Post.

You might want to be careful about this after reading this article on slashdot:

Facebook Lets You Harvest Account Phone Numbers