The Galaxy Note 9's modem is the same as the one in the Galaxy S9+, which is great news. This chart shows you how the Galaxy S9+ gets better LTE speeds than either previous Galaxy generations or iPhones, thanks to its Category 18 Qualcomm X20 modem. It supports all of the frequency bands, and all of the band combinations, used by every North American carrier.
I know 5G is coming next year, but I wouldn't worry about that too much; it will be at least another year before 5G is widespread and before chipset makers work out the power-management kinks that come with new wireless data systems. Meanwhile, I've seen the existing X20 modem get speeds up to 700Mbps with the right carrier setup, showing there's still plenty of room in 4G.
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