Why does the text message show that there is no mobile phone number?

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

Method 1: You can change your mobile phone and see if you can send and receive short messages.

Method 2: 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.

Method 3 If not, I suggest you check whether there is a problem with the sim card;

Method 4: Check whether the number of SMS center is set correctly;

Method 5: Take the mobile phone card to the local business hall for testing or replacement.