Slack, one of the world's most popular group messaging apps that is widely used in corporate settings, announced that it rolled out a voice calling feature on Wednesday, enabling its users to not only chat with one another but also call each other.<br />The upgrade to Slack's services has been one of the most requested upgrades from the app's 2.3 million daily active users and 570,000 paid subscribers.<br />Currently, the upgrade is available to some of the app's users, but is still limited to Slack on desktop on the Chrome browser.<br />As for those who are using Slack for mobile, as well as those who are wishing for Slack video calls, there is still some waiting that is to be done.<br />Slack, however, promised that other upgrades are coming soon.<br />With the addition of voice calling and/or conferencing, Slack has managed to become one of the biggest threats to web-based voice calling giants such as Skype and Google Hangouts.
