What does the receipt SMS contain?

There are generally three kinds of reports on the content of receipt SMS:

1, sent successfully: the other party will receive the SMS immediately after sending;

2. Not delivered yet: after sending the SMS, it cannot be delivered to the other party in time due to reasons such as power off, out of service area or full SMS space;

3. Sending failure: the other party's number does not exist, or the other party has been turned off for a long time or is not in service area.