What does the SMS center number do?

We use mobile phones to send text messages, which are actually transmitted by moving. For example, mobile users in Shanghai share an information center number. When you send a message, you actually send it to the information center platform, and the information center forwards it to the other party's mobile phone. If you send a message to a friend in Beijing, it is also transferred through the information center, just to the information center platform where the other party is located, and then your friend will receive the message. It is worth mentioning that the information center in Shanghai can only identify numbers passing through Shanghai. You are the mobile phone number in Shanghai, and you changed it to the number of the information center in Beijing. When sending short messages, the information center in Beijing will not provide you with access, and you will not be able to send or receive any information.