What is the reason why Samsung mobile phone can't send short messages suddenly?

Dear Samsung users: If the mobile phone can't send short messages, I suggest you: 1. Check whether the phone bill is sufficient. 2. Check whether the information center number is entered correctly: information-menu key-settings-SMS settings-information center-set the information center number (please contact the local network operator for the information center number, and the telecom card is not set with the information center number). 3. Check whether there is virus software in the mobile phone. Check mode: Settings-Application Manager-Run-Check whether there is a Com.android.version process running. If there is this program, please uninstall, delete and restart the phone. 4. Try to replace another SIM card. 5. Check whether the machine has a firmware/system update push notification. If yes, please upgrade your phone to the latest version. 6. If it is invalid, please back up data (contacts, multimedia files, etc.). ) and restore the machine to factory settings. (Note: update the version or restore relevant materials before leaving the factory, so as not to affect the use) If you have any comments, suggestions and complaints, please click: support.samsung.com.cn/survey.