Why do you always receive text messages from multiple calling cards under the name of Zhengzhou Public Security Bureau?

This kind of short message is a kind of reminder message sent by the government department, which is usually sent in his area. You have never disclosed the number, but the number you run is run by three major operators, backed by the public security department. This is not fraud, but a kind reminder from the government. I often receive SMS reminders from the public security department to prevent being cheated.