I am Unicom's 3G card and mobile phone. You can make a phone call and surf the internet. But the text message can't be sent out. What's the problem?

The processing method that the mobile phone cannot send short messages is as follows:

First, you can change your mobile phone and see if you can send and receive text messages;

Second, if you can send and receive short messages, I suggest you plug the card back into your mobile phone and send yourself a short message to see if you can receive it.

Third, if not, I suggest you check whether there is a problem with the sim card.

Fourth, check whether the number of the SMS center is set correctly;

5. Bring the mobile phone card to the local business hall for testing or replacement.