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From a new or existing chat, select
Video call in the upper corner. If you don't see Video call, select the down arrow by Audio call. You can also start a chat as an Audio call, and select Video call later. -
A call starts by ringing the participants. If the person doesn't answer, you can leave a message.
For info on creating a chat, see Start a chat.
Tip: Adjust your video or audio before a call. For more info see Make a test call.