The mobile phone automatically sends SMS to check the traffic.

The reason why Xiaomi's mobile phone keeps checking the package balance and sending text messages may be that the auto-correction function has not been turned off. You can turn off the AutoCorrect function in the network assistant, so that you won't receive text messages. The specific operation steps are as follows:

1. Go to Desktop-Security Center-Network Assistant-Menu-Settings-Correction Automatic correction in traffic data is turned off.

2. Check whether some applications in the mobile phone have enabled automatic traffic checking. You can find and close these applications.

I hope the above information can help you solve the problem. Please feel free to let me know if you have any other questions.