What should I do if my mobile phone often sends short messages to malicious codes?

First of all, distinguish the problem of mobile phone from the problem of mobile phone card, and try to determine the root of the problem with other mobile phones (their own cards) or other mobile phone cards (their own phones). If there is something wrong with the mobile phone, you can restore the factory settings and reinstall the downloaded software; If there is something wrong with the mobile phone card, find the operator or replace it.