Is there any additional charge for sending text messages while on-hook?

On-hook SMS services are as follows: On-hook SMS provides customers with a new form of direct media service. When the system determines that the called party is in a call state, and if it meets the called party's settings (such as connected, busy, no answer), it will selectively send the message to the calling customer (only the calling number is a mobile phone or PHS). Customized text message for the called party. The text message content can include phone number, company name, product brand, office address, promotional information, personality statement and other information. It can not only assist the called user in advertising the company's products, but also facilitate the calling user to save the merchant's consultation information. Applicable to PHS customers, Tianyi mobile phone customers and postpaid landline customers. Each package of this product cannot be processed at the same time. Function introduction: 1. By analyzing the call status of the dialed customer (such as: connected, busy, no answer), the on-hook SMS service system will judge the dialed customer and then send the SMS specified by the enterprise. 2. Customers can choose different call statuses to send different text messages to meet their needs for advertising or self-expression to forward customers. On-hook SMS sending: can be sent to China Mobile mobile phone numbers, China Unicom mobile phone numbers, China Telecom Tianyi mobile phone numbers and PHS numbers. Standard version: The standard version provides customers with the SMS reporting function. This product cannot be sold alone and must be sold as an on-hook SMS package. PHS, postpaid landline, and prepaid Tianyi mobile phone customers: can apply through the account manager or business office. Postpaid Tianyi mobile phone customers: You can apply through Huango, No. 10000, account manager, or business hall. To learn more about service discounts, click the "official website" below and customer service 222 will answer your questions.