Section 145 The Internet of Things can only receive targeted short messages. What happened?

Regional restrictions. The development of science and technology has changed people's way of life and work. Intelligent devices such as public walkie-talkies say that the Internet of Things cards used by the three major operators (China Mobile, China Unicom and China Telecom) are mobile communication access services provided for Internet of Things users based on the Internet of Things private network. Directional SMS refers to that the Internet of Things card can only use the number of SMS management platform to send and receive short messages, and the Internet of Things card can only use the Internet of Things card to send and receive short messages, and the short messages between the Internet of Things card and the telephone number of public mobile network.