Why does my mobile phone often send short messages to telecom, but the other party can't receive them?

First of all, you should make sure whether your short message was sent successfully. Second, is the other party's SMS function normal? SMS space is full, so I can't receive messages? Did the other party download the interception software in the mobile phone? Whether it has entered the blacklist of the other party. Finally, I would like to give you a suggestion: If you are a mobile customer, you can open a "short message receipt" function, charging 3 yuan/month, so that you can clearly know whether the short message you sent is "received", "not received" or "failed to send". . You can edit the initial letter of the short message "KTDXHZ", that is, "Enable SMS Receipt" to 10086, and this function can be successfully enabled! I hope I can help you!