What business is Shaanxi Unicom SMS firewall?

Shaanxi Unicom SMS firewall service is a service that filters the calling number and receiving time of users' short messages in the case of spam or malicious short messages. Users can set a specific mobile phone number or SP code to the blacklist. All messages sent through these numbers will be automatically filtered by the system, and the filtered messages will be stored for users to query and download through the WEB.