What is the use of "SMS center number"

The number of SMS center is actually a transit point for sending and receiving SMS.

With this number, the mobile phone can receive all kinds of short messages.

Now the mobile phone no longer needs to input by itself, and it will automatically input after loading the card.

But don't change the number of the short message center. After the change, the SMS will not be sent successfully, and the numbers of SMS centers in different regions are different.