Preventing a message from being deleted
You can lock a message to prevent it from being deleted even if you delete the other messages in the
conversation.
1.
Open the Messages app.
2.
Tap a contact (or phone number) to display the exchange of messages with that contact.
3.
Tap the message that you want to lock.
4.
Tap
Lock message
on the options menu. You'll then see a lock icon for locked messages.
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Messages