The use of cellular-based technologies is widespread for the networking of smart devices. In addition to LTE Cat. M1, the Narrowband Internet of Things (NB IoT) is also available. This is designed to transmit even smaller data volumes and has higher latency times than LTE Cat. M1. Thus, NB IoT is less suitable for the transmission of time-critical data, but it has its own advantages, such as the higher battery life and lower costs. In this article, you can discover how the mobile communications technology functions and for what applications are its features beneficial.