While the era of 5G is about to take off and LTE/4G has become a standard, legacy technologies are still needed. There are many end-users who cling to their old devices, but these will never be able to support the new technologies. The same is true for M2M environments which are also based on these traditional, simple and uncomplicated technologies.
However, frequencies are scarce, and the parallel maintenance of different technologies is expensive and erroneous. Many operators have already started to unplug their 2G and 3G networks, with many implications for MNOs, their roaming partners and their subscribers. Unfortunately, there is no coherent global strategy, so everyone has to keep up with the latest technology sunsets by themselves. Fortunately, there are already sound solutions in place to avoid time-consuming research across various sources.