Why does the short message symbol keep jumping? How can I get rid of it?

Hello, landlord, it is estimated that you just bought Xiao 5 not long ago. This problem is solved in this way. The small envelope should indicate that the information on your SIM card is full. It is estimated that the MMS and SMS you deleted are in the deleted mobile phone. The specific operation method is as follows: information-left function key "Options"-select "sim card information"-just delete all, so that the small envelope will not flash. In addition, this prompt may appear if you have installed software to send and receive e-mail or software to block spam. It may be that the blocked information or the mailbox is full, so just delete a part.