What's it like to send someone a text message showing that you haven't sent it yet?

Find the information center in SMS settings. After opening it, you can see the number of the information center. If it is not a string number of +86, the short message sending will fail. At this time, you need to contact Mobile/Unicom/Telecom customer service to modify the correct number of the information center, and the short message can be sent immediately.

2. The other party set up a firewall, and your short message was successfully sent, but someone else's mobile phone refused to receive it. Charge as usual, indicating that the delivery was successful, but the receipt received was a failure.

3. The other party's mobile phone is turned off, or there is no signal. The short message you sent was not received by the other party, but if the time exceeds the validity period of the short message set by the other party, you will also be prompted to send it successfully, but the receipt you received is a failure.