You can delete the chat history for an individual or a group chat. This clears the chat history on your device, but the other participants will still be able to see the chat.
To clear your chat history:
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Select the group or individual chat that you want.
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Select the group or contact's avatar (profile picture), then select Settings .
Tip: On iPad, either select Settings from the top of your group or the avatar from the top of a one-to-one chat.
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Select Clear Chat History.
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Select Clear or Yes to confirm. Your chat history will be cleared.
Important: Once you’ve cleared your chat history from your device, you can’t recover it.