this post was submitted on 12 Sep 2023
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That used to be the case, but most phones now use radios that can support necessary frequencies and protocols globally. It's also helped that the network side has also been more standardized compared to the 3g days.
5G in Europe and in the US is completely different still.
As far as I can tell it's just the C band frequency range, and radios supporting either generally support both.
Many manufacturers released their phones without mmWave antennas outside of the US. Like iPhone 13 or Pixel 6.
Even in the US, only some high end phones support mmWave. It's never required for service as the few areas covered by mmWave also have low or mid band 5g coverage too.
That's not what this thread is about.