is the 7 series dual SIM in the UK like the 6
Yes it has dual sim slot. You can find that in the specs.
I understand that these are dual nano SIM. Are they dual active? How do they work? Can I make a call from second SIM while data (LTE) is active on first SIM?
Yes you can indeed. Making a call and it ask from which number.
I used to have one sim for only calls and the other one for LTE.
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