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What does short message of public security lock business mean?

Prevent deleting short messages by mistake. Locking business SMS is to protect information as a special single lock, and public security locking business SMS is to prevent SMS from being deleted by mistake. Locking information is to protect an important piece of information from being deleted by mistake. Deleting in the short message list means deleting all the short messages with someone, but if some information is locked, it will not be deleted together.