Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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iTunes UK Movies and TV Soon?
According to Ars, everything is set up and ready to go and is "just a matter of flipping the switch".
No details on which shows or movies would be available.