Xiaomi 4 mobile phone monthly subscription information

obviously, this is caused by the automatic traffic calibration function of the third-party software installed on your mobile phone. When the software automatically calibrates the traffic, it will send a short message to 186 to inquire about the remaining traffic. See if there is a mobile phone security software like 36, LBE or Kingsoft installed on your mobile phone. There is a traffic calibration in it. Just turn it off.