Someone sent a malicious message to the recipient P. Can you find my phone number in the business hall?

Generally don't check the business hall. If the impact is great, you can call the police and ask the police to investigate.

Or you can warn him first, and if you join the SMS blacklist, you can directly block his SMS. There is really no way to call the police. According to the Law on Public Security Administration Punishment, if the same person tickles you more than five times, you can sue him and ask the law to protect your legitimate rights and interests.