A psycho who wants to chase me has been harassing me with phone messages. It's annoying. What should I do?

No need to change the number, and no need to set it as a blacklist!

When changing the number, this number has been bought by others. If he sends it again, please reply and say whether you sent it by mistake. I don't want the person you are looking for. If he sends it again, you can reply that he is crazy or scold him. Don't use your language rules (don't put a full stop at the end), just to make him feel that the owner of this number is not you. If he calls, if there is a man among your friends who he doesn't know, you can ask him to pretend to be the owner of this mobile phone number and talk to him. I'm sure you can cheat him, you don't have to change the number, there's everything in the phone! I hope you try!