US v UK iPhones
I'm shortly going to be in America for 6 months, shortly before leaving 2 weeks I'm due to upgrade my phone, I'm thinking about buying one in America rather than in the UK due to the price difference. However when I was in the Covent Garden store(London UK), the staff member said that the phones are different and when I returned I would not be able to use 4G or 5G if I bought the US version as they are not compatible.
Is this correct? I don't believe it is?
iPhone XS