I can't send short messages recently, which means that sending failed, but I can receive short messages.

If you are a Unicom mobile phone customer, you can't send SMS for the following reasons:

1, the mobile phone card is not opened normally, and it may be impossible to send short messages in the state of arrears or active shutdown;

2. The SMS center number in the mobile phone is incorrect, and the SMS center number of mobile phones in each region is different. You can call Unicom customer service to which your mobile phone card belongs for consultation.

3. The SMS sending function of your mobile phone card is not enabled normally. You can use this machine to dial the Unicom customer service hotline 100 10 to which your mobile phone belongs, and ask the Unicom staff to help you check whether the SMS sending function of your mobile phone card is turned on normally.

4. Due to the failure of the mobile phone terminal, the short message cannot be sent. You can put your mobile phone card on the mobile phone of your family or friends to see if you can send text messages. If you can, it means that it is a problem with the mobile phone terminal, and you need to contact the mobile phone terminal for after-sales consultation. If you can't send it, you can contact Unicom's customer service hotline 100 10 for consultation.