True. But note that in 3G and 4G period, there are a number of systems that are not compatible to each other, like UMTS vs CDMA, LTE vs WiMAX, while 5G is the g

True. But note that in 3G and 4G period, there are a number of systems that are not compatible to each other, like UMTS vs CDMA, LTE vs WiMAX, while 5G is the global one.