Mobile phones automatically send text messages for no reason.

Malicious programs, mobile phone poisoning, "cloud" control, etc.

1. Malicious programs: Malicious programs will run in the background and send unauthorized short messages. This is caused by malware or virus.

2, mobile phone poisoning: mobile phone infected with viruses or malware, will automatically send text messages. Use security software for mobile phone scanning and cleaning.

3. "Cloud" control: Some mobile phones will be connected to the cloud service, and the service will remotely control the mobile phones and send short messages. Ensure the security of cloud account and mobile phone settings, and carefully check the permissions and settings related to cloud services.