Why can’t QQ mobile phone send text messages sometimes?

Hello, the main reasons are: 1. There is a problem with the local SMS center. When this happens, you cannot use your mobile phone to successfully send text messages to the called number of Super QQ, which shows that sending short messages fails. Please check whether the SMS center number is set correctly and test whether mobile-to-mobile SMS can be sent; 2. There is a problem with the SMS gateway and the message cannot be transmitted to Tencent's platform. At this time, the message is sent successfully, but the mobile phone does not respond; 3 , the line between the SMS gateway and the Tencent system platform fails, and the mobile phone cannot receive messages at this time.