Samsung still offers Edge Lighting on current flat-screen Galaxy phones, though the notification effect is turned off by default in One UI.
One UI lets users enable the feature and customize effects, colors, transparency, width and duration, keeping alive a tool originally built for curved Edge displays.
Those older Edge screens made the glow visible even when a phone was face down, giving the feature a practical alert function that has largely faded with flat displays.
The feature now serves mostly as a customization option, resurfacing as leaks suggest Google may add a similar notification-light system to upcoming Pixel devices.
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