What are the types of domestic spam messages?

Domestic mobile phone spam messages are divided into the following four categories:

1. Harassment type, mostly boring pranks;

2. Fraudulent type, such Most text messages are intended to defraud money, such as lottery winning information;

3. Illegal advertising text messages, such as selling black cars, anesthetic guns, etc.;

4. SP (SMS service provider) Illegal mass sending, misleading customized SMS services, and the sending numbers are mostly SP access codes.