https://techcrunch.com/2018/07/31/whatsapp-group-voice-and-video-calls/

WhatsApp has added a much-requested new feature after it began to allow users to make group voice and video calls.

It’s been just over three years since the company, which is owned by Facebook, introduced voice calls and later a video option one year later. Today, WhatsApp counts over 1.5 billion monthly users and it says they make over two billion minutes of calls via its service each day.