Under what circumstances will I receive a communication big data travel notice?

Today, I received the verification code of a communication travel card for no reason, mainly because:

First of all, you received the SMS verification from travel itinerary, indicating that someone is using your mobile phone number to register or activate related functions, or someone is verifying such information, and then the number is wrong, and it is your mobile phone number, which can be ignored. Secondly, it is possible that the mobile phone number was leaked and maliciously registered. At this time, it is necessary to promptly investigate the possibility of leakage and feedback the problem.

Introduction:

Communication Big Data Travel Card is a free inquiry service for 654.38+06 billion mobile phone users nationwide, which is obtained by China Xintong Institute, China Telecom, China Mobile and China Unicom by using the "signaling data" of mobile phones. Mobile phone users can query all the city information they have visited in the previous 654.38+04 days through this service.