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You can launch calls from one-on-one or group chats:
-
From your chat list, tap New chat 
in the header and enter a name or names.
-
From a chat, tap Video call 
or Audio call 
. The person you're calling can answer from their desktop or mobile app.
You can also start a call from someone's profile card. Open it by tapping their profile picture in a channel or from a search.