After Huawei P20pro updates the system, what is the reason why SMS can't always be sent out?

Dear, you have to confirm whether the sim card has passed the operator's real-name registration system registration certification! If the information when handling the sim card does not match the ID card information, there may be abnormal signal! Can't talk, can't send and receive short messages, can't surf the Internet for data services, and so on. Real-name registration system certification can consult operator customer service! Or confirm whether the number of the SMS center is set correctly. You should consult the operator for details! When the cell phone is in a place where there is no signal or the signal is weak, the information may not be sent successfully. You must try again where the signal is strong!