There are a few ways to delete messages on your iPhone, depending on whether you want to delete a single message, multiple messages, or an entire conversation.
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Open the Messages app.
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Go to the conversation that contains the message you want to delete.
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Swipe left on the message.
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Tap the Trash icon.
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Delete multiple messages:
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Open the Messages app.
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Go to the conversation that contains the messages you want to delete.
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Tap and hold on a message bubble.
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Tap "More."
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Tap the circles next to the messages you want to delete.
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Tap the Trash icon in the bottom left corner.
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Tap "Delete" to confirm.
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Delete an entire conversation:
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Open the Messages app.
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In the list of conversations, swipe left on the conversation you want to delete.
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Tap the Trash icon.
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Tap "Delete" to confirm.
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Here are some additional things to keep in mind:
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Deleting messages on your iPhone will not delete the message for the other person in the conversation.
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You can also delete attachments, such as photos and videos, from messages. To do this, tap the attachment, then tap the Trash icon.
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Messages that you delete are not stored in iCloud. Once you delete a message, it's gone for good. However, there is a short window of time where you might be able to recover a deleted message using the "Recently Deleted" feature in Messages [Recover deleted messages on iPhone, Apple Support].