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To keep track of an important conversation, you can pin it to the top of your Chat or Spaces list. Tip: A red dot appears next to pinned conversations with unread messages. Android ComputeriPhone & iPad.
You can pin an app's screen to keep it in view until you unpin it. For example, you can pin an app and hand your phone to a friend. With the screen pinned, your friend can use only that app. To use your other apps again, you can unpin the screen. Important: You're using an older Android version.