5G is not a replacement for 4G. 5G has half the coverage (so you need a lot more cell towers) and the bandwidth of 4G isn't really used at the moment anyways.
5G is useful for low-power IoT devices, as the power consumption is a lot lower.
So I doubt companies will switch off 4G anytime soon. It wouldn't make any sense.
5G range depends on the freq they are using tmobile is going to use both low band and mid band primarily with mmwave (super short range) in dense populations.
However most providers are refarming spectrum and bandwidth for 5G from 4G.
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