Why do users receive on-hook messages, and will they be charged?

when the user dials the number of the enterprise that has handled the on-hook short message service, the on-hook short message will automatically send the user an on-hook short message preset by the enterprise. Users who receive the on-hook SMS will not be charged any fees. Customer service 21 will answer for you. Broadband service can self-help troubleshooting, which is simple and easy to operate. In addition, it can handle work order inquiry, ITV troubleshooting, broadband application and password service, which is convenient and fast. Please pay attention to China Telecom's Guizhou customer service for more functions.