Why is the label of SMS always flashing?

The flashing SMS icon indicates that you have information, but you haven't received it yet. One reason is that your mobile phone is full, and the other reason is that your mobile phone can't accept information: for example, if there is no information center, you can call Unicom 100 10 and Mobile 10086 for advice on how to set up a trust center. Otherwise, change your mobile phone and see if you can get the text message. Maybe there is something wrong with your mobile phone.