HTC DESIRE 526 User Manual page 161

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. A lock icon
Messages
is displayed.
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