How does China Telecom's 4g mobile phone send SMS to order traffic packets?

Edit SMS: 4 122 10 send it to 1000 1 order 60M mobile internet access 10 yuan package.

Mobile phone editing SMS: 4 12220 Order 20 yuan Package 150M Mobile Internet Package.

Edit SMS for mobile phone: 4 12230. Subscribe to 30 yuan Package, 300M-m mobile phone Internet package.

Edit SMS for mobile phone: 4 12250. Subscribe to 50 yuan Package, 800M mobile phone Internet package.

Edit SMS: 4 122 100, order 2G mobile internet package 100 yuan package.

Edit SMS: 4 122200 Subscribe to the 200 yuan Package with 5G mobile Internet access.

Mobile phone editing SMS: 4 18 10 is opened 10 yuan package includes 60M traffic and meals.

Mobile phone editing SMS: 20 yuan Package 150M flow meal package is opened on 4/0/820.

Edit SMS on mobile phone: Open 30 yuan Package 300M traffic package on 4 1830.