LED flash alert is not working during calls on my iPhone
Why my led flash isn’t working only in calls
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Go to Settings > Accessibility > Audio & Visual, then turn on LED Flash for Alerts.
Flash the iPhone indicator light for notifications - Apple Support
This is extracted from the above link --> "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."
How to turn on LED Flash for Alerts · Open the Settings app, tap Accessibility, then tap Audio/Visual. · Turn on LED Flash for Alerts. No alt ...
Get LED flash alerts on your iPhone or iPad