My Apple phone can't receive the verification code and send short messages. I used to send too many verification codes and then I couldn't send messages. I can't get the verification code, and I still

My Apple phone can't receive the verification code and send short messages. I used to send too many verification codes and then I couldn't send messages. I can't get the verification code, and I still can't get it after half a year. In the case that there is nothing wrong with the mobile phone, it is likely that the SMS service center number in your Apple mobile phone has been deleted. You should check whether the number of China Mobile/SMS Function Center in the settings is available. If not, sending and receiving text messages will not work properly. You must fill in the SMS center number again to restore the normal SMS sending and receiving function, as shown below!