Is it illegal to send manual text messages?

Sending manual text messages is not illegal.

It's not illegal.

If you are suspected of fraud, it is illegal.

Provisions of People's Republic of China (PRC) and the Supreme People's Court, People's Republic of China (PRC) on Several Issues Concerning the Application of Laws in the Trial of Civil Disputes over Infringement of Personal Rights and Interests by Information Network Article 12 If Internet users and Internet service providers use the Internet to disclose personal privacy and other personal information such as genetic information, medical records, health examination materials, criminal records, home addresses, private activities of natural persons, causing damage to others, and the infringed party requests them to bear tort liability, the people's court shall support them. Article 15 points out that the people's court shall support those who hire, organize, instruct or help others to publish or forward network information that infringes on others' personal rights and interests, and the infringed party requests the actor to bear joint and several liability.