How to solve the problem that Xiaomi mobile phone can't get the SMS center number?

There's no need to get it. Go and modify it directly.

Operating Steps: Information-Settings-Advanced Settings-Set the number of the information center. . Just modify it.

The correct statement should be:

Move +86 1380 * * * 500 (the * in the middle is your area code. If it is less than 4 digits, add 0, for example, Beijing is 0 100).

Unicom is +86 130 * * * 500.