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Flash the iPhone indicator light for notifications
You can set the iPhone indicator light to blink when you receive a notification. This can be useful if you can’t hear the sounds that announce incoming calls or other alerts, or if you might miss audible alerts in a noisy environment.
The indicator light is the light-emitting diode (LED) located on the back of iPhone, next to the camera lens.
Go to Settings
> Accessibility > Audio & Visual, then turn on LED Flash for Alerts.
Turn any of the following on or off:
Flash While Unlocked: The indicator light flashes even when iPhone is unlocked.
Flash in Silent Mode: The indicator light flashes even when iPhone is in Silent mode.