Send SMS by yourself when the mobile phone card is newly installed.

Mobile phone system error, malware or virus.

1, mobile phone system error: Sometimes the mobile phone system will be confused, causing some programs or software to send short messages incorrectly. This situation should be solved by restarting the mobile phone or updating the mobile phone system.

2. Malware or virus: Some malware or viruses will be hidden in the background program, automatically sending text messages or making phone calls. In order to protect the security of mobile phones, install anti-virus software and conduct regular security scanning.