How do telecom mobile phones handle value-added services through SMS?

The specific method is as follows: 1. Send "1000 1" or any undefined content to No. 1000 1, and the system returns to SMS to display the first-level main menu of SMS business hall. 2. Each option in the menu is marked with a numerical code. If you reply to a numeric code, you can open a lower-level menu or perform a specific function. 3. You can find the final function step by step according to the menu prompts, and then handle the business according to the prompts. For more service benefits, click on "official website" customer service 222 below to answer your questions.