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Yes, Nokia 8.1 does have the EIS. It also has OIS also.
Yes, Nokia 8.1 does have OTG support.
Yes, with Nokia 8.1 you can record 4K videos @ 30 fps.
Yes, Nokia 8.1 is a dual sim mobile phone.
Nokia 8.1 comes with the Android Pie out of the box. You will also get Android updates for the next 2 years.