How to open SMS package service for telecom mobile phones?

Hello, SMS package is a preferential SMS service provided by China Telecom for mobile users of China Telecom. Users only need to pay a specified amount of SMS package, and they can enjoy the preferential treatment of sending SMS whether inside or outside the network.

The SMS contained in the SMS package is limited to domestic point-to-point SMS (inside and outside the network), and the SMS outside the package is charged at 0. 1 yuan/article. The same SMS package can only be processed once, and 5 yuan SMS package, 10 RMB SMS package and 20 yuan SMS package cannot be used together.