Why are text messages sent by novice mobile phones blocked?

Violation of some illegal projects or something.

Call the operator to unseal it. If it's just a text message, it may be fraud, so be careful. SMS messages are automatically blocked, and messages sent to others usually contain sensitive words. Or send text messages to others in groups, which contain sensitive words or promote something, and are regarded as spam messages. If you want to reopen the SMS function, you usually dial 10086 for the first time. If you are blocked again, you can only go to the local business hall with your ID card and mobile phone card. If you want to write a letter of guarantee, you can't send similar messages in the future.