The mobile phone can receive SMS normally, but what is the reason why it can't send SMS?

The mobile phone can receive SMS normally, but it can't send SMS. The possible reasons are: 1, whether the SMS service has been opened normally; 2. Whether the mobile phone is in arrears, and if it is in arrears, pay the fee first; 3. The mobile phone can't send short messages to all numbers: (1) The short message of the mobile phone exceeds the standard, or the short message content contains illegal words, which causes the short message platform to list the number in the short message sending blacklist; (2) Due to the problem that part of the smartphone crashes, you can restart the phone and try again. 4. The mobile phone sends normal messages to other numbers and cannot send short messages to individual numbers. If it is normal to dial the other party's number, it may set problems for the other party's mobile phone (such as setting blacklist, firewall, call screening, call restriction, etc.). ), and can remind the other party to check the phone settings or delete the caller from the blacklist. For more service offers, click on "official website" Customer Service 2 18 below to answer your questions.