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Something something EU has other standards then USA, for example with Walkie talkies its illegal to use frequencies that US uses in EU and the other way around.
Its the same with cellular, US and EU has other Standards and the eff device may not be suitable to use those frequencies
Phones bought in the US work in Europe and vice versa.
Most phones support multiple regions’ frequency bands, especially these days. Some don’t, probably mostly older ones. Manufacturers used to make different versions of the same model for different regions.