What happened when the mobile phone sent a text message to Unicom 150 1 for no reason?

It is recommended to confirm whether there is a corresponding deduction, and then check whether the mobile phone has downloaded any software APP or embedded any software that causes the mobile phone to automatically send SMS (if you don't know how to troubleshoot, please ask the mobile phone seller or the staff at the maintenance point for help). If abnormal software is found, it is recommended to delete and back up the mobile phone data immediately and format the mobile phone. After the above processing, observe whether there is a similar situation in the mobile phone.