Why can't I see anything when I click on the blank of iphone SMS?

The system program is confused or there is something wrong with the mobile phone card.

Solution:

If there is a problem with the mobile phone card, you need to call the designated operator (Unicom, Mobile or Telecom) to help solve it. If it can't be solved, try changing a mobile phone card. It may also be that the mobile phone card itself has not been upgraded. Upgrade your mobile phone card, connect to itunes, find the system, and click Upgrade when prompted.

Go back to the main interface, double-click the home button, close the SMS, and then enter.

Click "Edit" in the upper right corner of the information interface directly, and the information program will flash back and re-enter.