The so-called 'red mode' was introduced with Apple's iOS 17 operating system as part of StandBy - a customizable Lock Screen feature designed to help users relax and sleep better.
When Night Mode is turned on for StandBy, the screen adapts to low ambient light at night, displaying items with a red tint to minimize disturbance while you sleep.
Users can set the feature to either 'Automatically', which adjusts based on the ambient light around the device, or 'After 20 Seconds', which activates red mode when the phone is charging.
Some users were confused when their screen turned red unexpectedly, and a Redditor commented on being impressed with Apple's innovation despite being a hardcore Android lover.
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