Which smartphone will work in US and Europe?

Hi, I m from Germany and just came to the U.S. a few days ago and planning to stay for at least one year, so I need phone that works properly. I m currently using a Galaxy S8 but it does not work here. Which smartphones (and model) will work in the U.S. and Europe accordingly? And will I have to take any special... show more Hi, I m from Germany and just came to the U.S. a few days ago and planning to stay for at least one year, so I need phone that works properly. I m currently using a Galaxy S8 but it does not work here. Which smartphones (and model) will work in the U.S. and Europe accordingly? And will I have to take any special carries into consideration?
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