Huawei nova2s mobile phone automatically sends text messages?

In the mobile phone, some text messages that you haven't sent automatically appear. The content of the text messages is a string of numbers or letters.

The cause of the problem:

In order to display your current traffic usage, some third-party applications will automatically send traffic inquiry messages to operators to inquire and confirm your traffic usage.

Solution:

You can go to Settings > Applications and Notifications > Rights Management > Rights > Send SMS, view the list of applications that have the right to send SMS, and turn off the permission switch of the application as needed.