The number has been cancelled, why does the text message show that it has been delivered? Why

Windows Phone) You can press and hold the text message and select View Report to see whether the sending status is successful. You will receive a successful sending report, or a red message will be displayed on the sent text message. The message was not sent to the other party's phone due to reasons such as an exclamation mark or the other party's phone being turned off. If the other party's number is down or empty, the prompt sent successfully must have been received. Specifically, which text message is sent successfully? (For Android phones or Apple phones, when the signal is good or the other party turns on the phone, you will receive the text message, and it will prompt that the sending failed. If there is no prompt, it may be because of a signal problem