What letter should I send to the front desk with someone else's mobile phone number to check the action track?

The last four digits of CXMYD# ID number.

Edit the SMS: "CXMYD", send it to the mobile phone card operator, and then enter the last four digits of the ID card according to the reply SMS, and you can query the information of the provinces and cities (no cities) you have been to in the last month. You can check 10 times a day for free!

Mobile phone number inquiry track is a public service for mobile phone users' roaming information inquiry launched by China Telecom, China Mobile and China Unicom to help prevent and control the epidemic. You can check the trajectory of your mobile phone for free in the last month by sending a short message, which can help prove whether you left the city or came back from a different place in the last month.