The mobile phone will automatically send text messages. What happened?

Generally speaking, mobile phones have the function of traffic management, and they are automatically calibrated regularly. Send a free short message to the operator every day to check the traffic.

Settings: All Settings-Traffic Management-Package Settings-Automatic Periodic Calibration. This function can be turned on and off.

Some third-party applications, such as Baidu Mobile Guardian, automatically send text messages to 10086 every day to get the current traffic usage, which is used to show your current traffic usage;

Solution: Set-Permission Management-Send SMS permission, view the list of applications that send SMS, and "block" the SMS permission of third-party applications.