I hear you on that.
When I was upgrading, that was one of my search 'wants'. But I found that unless it is a Phablet or even a Tablet, to include a second sim would require removing something else that I would need more in the phone, like a 4G antenna, or storage capacity ...
If you do have any questions about gaining root access once you get back from your trip, feel free to PM me if you like.
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