Why don't I check the phone bill (mobile) operator to send a message?

First, check whether your mobile phone can be used normally and whether it has the function of sending and receiving short messages.

Secondly, you can check whether the number of the SMS center has been changed. The so-called SMS center number can be found in the program settings of the mobile phone. Generally, it is +86 1380 local area code 500 (if the local area code is three digits, it can be replaced by 0). If the SMS center number is wrong, the mobile phone will not receive SMS.

Thirdly, you can check whether your mobile phone card is cut and whether the SIM card is invalid.

After that, you can check whether the short message code of the phone bill is wrong.

Finally, if the above problems are normal, you can recall whether you owe money to stop work. Ha ha.