Mobile phone receives SMS: This mobile phone number is using your mobile phone! ! ! What's going on here?

Because there is another mobile phone with anti-theft tracking function. And the set notification number is your mobile phone number. So as long as you change your mobile phone with anti-theft tracking function, it will automatically send you that message. . . . My wife and I are connected to each other's mobile phones. As soon as the other party changes cards. You will receive such a text message.