One phone with all GSM Bands

Hello,
I travel internationally for work. I need a phone which is capable of being used in all GSM networks - I would prefer to be in 4G wherever possible - so, I am looking for all 4G bands to be in there as well.
I believe there is no android phone which has this capability today. Am I wrong?

I know iPhone does. I have never been an iOS user and never would want to be one (in the current trend).

Thanks.

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