WhatsApp is probably the most popular messenger service on both Android and iOS sides. Whatsapp developers, however, only integrate new features into the app step by step, so that progress is sometimes slow. It is now said that group calls will also be possible in the future. Whatsapp is slowly becoming a real competitor to Skype.
Sources
https://www.techzim.co.zw/2017/10/group-voice-calls-coming-whatsapp/
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