How long is the validity period of Tianyi 4G SMS and MMS package after application?

"E-Surfing 4G SMS and MMS package" is specially designed for postpaid Enjoy 4G primary and secondary card packages, postpaid Tianyi 4G building block packages, prepaid Flying Young4G packages, postpaid Flying Young4G packages, and prepaid Flying Young4G pure traffic cloud card package offers SMS and MMS package discounts for users. There are 3 levels for you to choose from, namely: 5 yuan for 100 items, 10 yuan for 200 items, and 20 yuan for 400 items. You can choose the appropriate discount according to your usage situation. The offer will be valid for 24 months after it takes effect. After expiration, if both parties have no objections, the contract will be automatically renewed for another 24 months. The SMS/MMS included in this offer are point-to-point SMS/MMS within mainland China (regardless of whether the network is inside or outside the network), and do not include uplink SMS from Taiwan, Hong Kong, Macao and overseas SMS and cooperative SMS services. The excess amount during the month will be charged at RMB 0.10 per item. You can only order one "E-Surfing 4G SMS and MMS package" per month, and you cannot order repeatedly. It can be processed through the SMS business hall and China Telecom business hall. After the discount application is successful, the discount will take effect immediately. The basic monthly fee for the month of application is calculated based on the actual number of activation days (from the day of network access to the end of the month); the optional SMS/MMS package is calculated based on days, and is rounded up to the nearest whole number. To learn more about service discounts, click the "official website" below and customer service 219 will answer your questions.