5G is 5th Generation mobile, reusing some of the 2G, 3G bands as well as some other spectrum like old TV and Radio wavelengths and those used for backhaul like the 3.5Ghz and 26Ghz old microwave links otherwise known as Fixed Wireless Access 3.5Ghz and 26Ghz bands to create faster data still. It builds on 4G and LTE with an even less legacy architecture