The Ministry of Industry and Information Technology (MIIT), on the basis of the "communication big data itinerary card", has launched the function of checking the place of visit outside the country, which can check the information of the countries or regions outside the country that the cell phone users visited in the previous 14 days.

The national mobile phone card "one card through the check" is guided by the Ministry of Industry and Information Technology, China Academy of Information and Communications Technology, China Telecom, China Mobile, China Unicom *** with the launch of public service inquiries, free of charge for the user to provide the number of phone cards under their own names. National mobile phone card "one card through the check" is mainly for cell phone users in China, the user can through the web page, such as query portal, enter the document information, cell phone number (at this stage only supports the second generation of residents ID card query) and enter the verification code to verify the operation of the person, by the service platform to the basic telecommunication enterprises, mobile resale of communications Enterprises query the number of mobile phone cards under the user's name, and by the service platform within 48 hours through a unified SMS port to reply to the user query results.