How can I get it back if the number of the SMS center is changed?

In this case, it is probably because the information and phone number of the mobile phone have been leaked.

In this case, you can do the following:

1. Check whether the SMS blacklist function is enabled. Whether the third-party security management software is used to intercept short messages, and whether the function is turned off or uninstalled. If not, please back up the data in your phone and restore the factory settings.

2. Download the application of the National Anti-Fraud Center for technical interception.

3. Call the customer service of China Mobile, China Unicom and China Telecom. The key is to see which operator's phone you are using, and let them solve it through technical support.