See ideally every 2G band apart from band 3 could be used for 3G and every 3G band could be used for 4G, the same way every 4G band is usable for 5G and will be so in the long run, so if your handset supports 13 bands for 5G then it's at an advantage over handsets which only support 5G on n78. So just like 900 and 1800 MHz bands were the face of 2G and 2100 MHz was the face of 3G in India 3.5 GHz will be the face of 5G but that doesn't mean that the other bands won't eventually convert to 5G.