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Yes, Nokia 8.1 does have the hybrid sim slot.
Nokia 8.1 has a double channel LPDDR4X type of 4GB RAM.
Yes, Nokia 8.1 does have OTG support.
Yes, Nokia 8.1 does have OIS support.
There is no official communication from the company if Nokia 8.1 will be able to work on the 5G network or not.