I'm thinking of buying an unlocked iPhone 15 Pro from Canada because it still has a sim slot, which is necessary since I travel a lot and want to have a local sim at times. I have T-Mobile in the US and live in New York. However, the Canadian iPhone is missing the mmWave 5G bands n258 (26 GHz), 260 (39 GHz), n261 (28 GHz). From what I can tell mmWave is only super fast when you are literally standing next to a tower. Would I be missing out much without them?