How is it that sending text messages to others with Xiaomi's mobile phone is rejected?

Dear users, hello! According to your description. You can do this: It may be that some applications in your system interfere with the normal operation of the system, especially some programs that have obtained root permission, so for the safety of your mobile phone system, please don't use root permission at will. It is recommended that you back up your data and enter recovery to clear all data. ...