There is still last building wave of 4G network in next 2 to 3 years worldwide. There may be 2 aspects about marketing insight:
a) In some country, the telecom consumption is still very high, some investors want to enter telecom domain, they are willing to invest in these countries. These investors are willing to invest some local small operators or create a new operator, they jump 2G/3G to 4G/5G directly, so they can surpass top operators easily in that country.
b) The whole 4G industry chain is very mature in global, and the network building cost is decrease substantially. Many enterprises and governments department are willing to build their own private wireless network.
4G Product Portfolio.PDF
5G Product Portfolio.PDF