Iphone only intercepts short messages, not black messages.

Click mobile phone settings to enter the settings page, slide down to find information, click enter information, slide down to find "filter unknown contacts", and turn off the switch at the back, so that the message prompts of non-contacts will be closed and classified separately, which can be viewed in "filter information" in SMS. Open the received spam message, click the "I" button above, and choose to intercept the other party's call or intercept the message.