Why can I call and send a text message, but I can't get a text message?

The number of the SMS center may be wrong. You use your mobile phone to send a message to your friend to see if he can receive it (I know you said you can send it, but the other party may not receive it). If not, that's the problem. Look in the short message and change the number of the information center to the same as others. I don't know the model of your mobile phone, I can only say so much.