What do you mean by flashing short message symbols?

1, the short message is full and not deleted in time, or there are unread short messages (the situation can be divided into the following categories) (1). Maybe you received a long message, but you didn't finish it, so your inbox keeps reminding you of unread messages. (2) You just changed your card to a mobile phone that stores few short messages, because the short messages on the original card cannot be stored in the new mobile phone. (3) It is also possible that the network is not good, the short message is not fully accepted, or the system problem of the mobile phone itself, especially the smart phone.