I often have a fixed strange number to send me such a short message: the mobile phone number that sent this short message is using your mobile phone, please pay attention! You can reply.

This is the "mobile phone anti-theft" function of mobile phone 360 guardian.

Someone set your mobile phone number as his contact information through the mobile phone 360 guard.

If he loses his mobile phone, the new number of the card will automatically send you a text message to inform you.

If the other person is not your friend, he may have written the wrong number or changed it.

You can try to contact each other's mobile phone number and tell them.