Short messages received by mobile phones are not deleted in time?

Many short messages don't crash, and the number of saved messages is not fixed. Generally, 16K SIM card can store 15 messages, and 30K SIM card can store 40 messages. Some mobile phones also have short message capacity, and can send hundreds of messages at most! Of course, the running speed will slow down if there are too many short messages, which is the same as the slow running speed if there are too many files stored in the computer.

And if the message is full and not deleted, new information will come in at the top.