My mobile phone is Nokia 5320xm. Why is it that sometimes when a short message comes, the prompt message is not displayed on the desktop and the envelope in the upper right corner is not displayed?

Did the mobile phone respond when the text message came? If the information box upstairs is full, it will be displayed and the envelope icon will flash ~ ~. It is estimated that there is something wrong with the mobile phone system, and there is no way. My problem has occurred before, and my solution is to press the dial +3+* button when turning on the phone until the screen changes. I suggest the landlord try it ~ ~