Joining an existing call
If a friend is currently pairing, you will see the yellow icon next to their avatar and a description of who they are pairing with below (more about showing who you are pairing with here: https://docs.tuple.app/article/67-showing-who-youre-pairing-with).
If you would like to join this pairing session, you can do so by clicking the Join call icon:
This will notify the call participant that you would like to join their call by showing them a pop up notification like this: