How can I be informed that the SMS was sent successfully?

Yes, there are three statuses: 1, and the sending is successful: the other party receives the short message immediately after sending. 2. Not sent yet: after sending the SMS, it cannot be sent to the other party in time due to reasons such as power off, out of service area or full SMS space. 3. Sending failed: the other party's number does not exist, or the other party has been turned off for a long time. SMS receipt refers to the business that customers receive the receipt message immediately after sending the message with China Telecom's mobile phone. The contents of the receipt include the status information and additional information of whether the receiver successfully received it. The length of additional information is limited to 44 characters (including punctuation marks), and the content involves cultural entertainment, life health, practical knowledge, hot events and other fields. For more service offers, click on "official website" Customer Service 2 17 below to answer your questions.