Why does the Redmi phone crash during phone calls and text messages?

Mobile phone system bug. Enter the phone settings--application management--click the phone dialer and text messaging program, delete all their data, and stop. Start again. Then restart the phone and see if the problem is resolved. Secondly, you can reset the system and see if the problem is solved. Third, download third-party text messages and address books to see if they are functioning properly. If possible, replace the ones that come with the system. Fourth, refresh the system.