Why did Xiaomi 2 have a short message voice prompt, but didn't receive any information?

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. For the security of the mobile phone system, please do not use root permission at will. It is recommended that you back up your data, enter recovery to clear all data (turn off the power, press and hold the volume up+power on button to enter recovery), and do not restore the settings and third-party security software in your mobile phone for the time being when recovering data. See if you can get back to normal.