I'm using an iPhone 7 running iOS 12.

When I'm in an on-going video chat, I can't find the "add people" button to add more people to the on-going video chat. In Android I can see that button just fine, so I'm surprised that iOS doesn't have it.

Do I need to activate it via settings or something?


I got it. It's not the iPhone's fault, it's the fault of the other phone which uses Messenger Lite. Messenger Lite doesn't have conference call feature (at this moment). So if Messenger (full version) calls Messenger Lite, the "add people" button isn't available. So I install Messenger (full version) for the other phone and try calling again, and now I can see the "add people" button.

Conference call feature on Messenger (full version)

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