Mobile phones often receive messages from strange numbers.

First of all, you have to confirm whether your mobile phone is a second mobile phone. Some mobile phones have anti-theft software when the original owner uses them. When they are stolen or sold to others, the phone will be tracked by the mobile phone anti-theft company after changing the card.

Second, when someone sets the anti-theft standby number, they mistakenly set your number as his anti-theft standby number, and you will receive this message as soon as his mobile phone changes cards.

Third, it is a prank. Someone randomly set the anti-theft backup number, and you unfortunately became the victim.

Generally speaking, you seldom send spam messages. You can call the mobile company and ask it to block your SMS number. Good luck.