How to identify short messages sent by "pseudo base stations"?

The method for identifying short messages of pseudo base stations is as follows:

1) The dual-card mobile phone receives spam messages almost at the same time;

2) You happen to pass by the place mentioned in the spam message;

3) The port number is too punctual, such as six sixes, or ends with numbers such as 10086 and 95588;

4) The reply 0000 cannot be sent, indicating that the other port number does not exist;

5) The reply to 0000 indicates that the business of * * Company has not been customized, indicating that the port number is forged;

6) There is no such record in the address book provided by the operator.