With the rapid development of IoT technology, people have a deeper and deeper understanding of NB IoT and 4G cards. So, what is the difference between them? First of all, from a technical perspective, NB IoT is mainly used to connect IoT devices. It has the characteristics of low power consumption, wide coverage, and low cost. It is suitable for applications that do not require high transmission rates but require connection reliability and continuity. More demanding scenarios. The 4G card is a communication module, mainly used in the fields of vehicles, smart wearables, smart homes and other fields. It has the characteristics of high-speed transmission and high frequency, and is suitable for scenarios that require high transmission rates. From an application perspective, NB IoT is widely used in smart parking, smart water meters, smart lighting and other fields, providing strong support for the intelligent construction of cities. 4G cards are more commonly used in high-definition video surveillance, smart homes, smart transportation and other fields, bringing convenience to people’s lives and work. In general, NB IoT and 4G cards play different roles in IoT applications, and understanding their differences is crucial to the development of IoT technology. In the future, as IoT technologies continue to innovate and develop, I believe they will bring more surprises to our lives.