Why can I still receive text messages when my mobile phone is intercepted?

Mobile phones have their own SMS blacklist settings, but there is nothing they can do in the face of SMS sent by SMS channels or "pseudo base stations". However, some mobile phones also have enhanced SMS blocking function. If you are an iPhone user, I believe you have received many spam messages from iMessage. In the latest version of iOS 7, you can automatically block these spam messages through the settings of Notification Center. After it is set, those spam messages sent through iMessage will not be displayed on our screen, and there will be no SMS voice prompts. At the system level of some Android phones, a shielding system will also be set in SMS, among which MIUI of Xiaomi has a very good shielding effect on SMS. In the process of use, it is found that it can not only automatically identify the short messages of operators and banks, but also automatically block some promotional short messages from short message channels or Taobao.