WhatsApp currently supports calling up to four people at one time.
That’s fewer than is supported on other top mobile messaging services — like Apple’s FaceTime, which was updated in October to support 32 people (up from only two people before); or Messenger, which can support up to 50 people in a call, for example.
https://techcrunch.com/2018/12/19/whatsapp-makes-group-calls-easier-but-calls-still-limited-to-four-people/
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