What do locked messages mean?
Locking a text message marks the message to prevent it from being deleted. There are still ways to delete locked text messages, the Lock feature just adds an extra layer of security to prevent accidental deletion.
How do you unlock a locked message?
Unlocking your Android device when messages are receivedTap on the App Menu icon (3 vertical dots)Select Options.Select Behavior.Turn on Show on incoming message.Turn on And turn on the screen.