Sure, I was in the US most of last year and A&T had already switched off 2G entirely. Verizon had refarmed much of their 2G network to 4G, to the extent they have now enabled GSM only handsets (their 2G/3G is CDMA not GSM) which can only get a signal on Verizon with 4G, so many people roaming the United States with 4G-LTE as their only option.
The way the US have rolled out networks, using 600/700MHz, means 4G can get better coverage and range than 2G.
T-Mobile US only has vestigial 2G service in many populated areas e.g. New York City, with 1 5MHz frequency remaining, the rest is refarmed to 4G. This would make using 2G very unreliable, but ok as an absolute last resort.
I suspect in the UK we will disable 2G as 5G becomes more main-stream.



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