Why can't the mobile phone send short messages?

The reason for this problem may be that the other party set up a firewall, and the short message was successfully sent, but the other party's mobile phone refused to receive it. Charge as usual, indicating that the delivery was successful, but the receipt received was a failure.

Another situation is that the other party's mobile phone is turned off, or there is no signal, and the short message sent by the other party has not been received, but if the time exceeds the validity period of the short message set by the other party, it will also prompt that the sending is successful, but the receipt received is a failure. It may also be a communication problem, which means it has nothing to do with the mobile phones of both parties. This may be a bad signal or a communication error.

Extended data:

1. Confirm whether the mobile phone is in airplane mode, and then contact the operator to check whether the mobile phone is turned off. After these two steps, you can basically find out the reason for the mobile phone or sm card.

2. If there is a problem with your mobile phone, you can set up a short message to see if there is any problem with the number of the short message center. You can call the operator's customer service phone to check the number of the local SMS center, or you can check it online. Generally speaking, if you can't send SMS after setting, there may be something wrong with the SMS application of your mobile phone.

3. SMS applications can be downloaded through third-party SMS applications, such as go SMS and Android SMS.

4. If the problem still exists, please try to restore the factory settings.