What's wrong with sending a text message with a report showing that it was sent successfully, but the other party didn't receive it?

First, the other party can't receive the reason:

1, the receiver's memory is full, just delete the redundant messages.

2. The receiver signal is poor, so it is recommended to send it to a place with good signal.

3. The processing of short message center is affected by congestion, packet loss or interconnection obstacles.

4. SMS function is not enabled.

2. The reasons why the SMS was sent successfully but not received by the other party are:

1, the receiver's memory is full, just delete the redundant messages.

2. The receiver signal is poor, so it is recommended to send it to a place with good signal.

3. The processing of short message center is affected by congestion, packet loss or interconnection obstacles.

4. SMS function is not enabled.

5. The memory of the receiver is full. Just delete the redundant information.

6. The receiver signal is poor, so it is recommended to send it to a place with good signal.

7. The processing of SMS center is affected by congestion, packet loss or interconnection obstacles.