Settings – “General” 
Tap “Accessibility”
Tap Switch 
in “LED Flash for Alerts”
Well done! Switch is on 
Your Camera LED will flash if you receive notifications or alerts
How to use Camera LED Flash for Notification and Alerts on iPhone 6S
Settings – “General”
Tap “Accessibility”
Tap Switch in “LED Flash for Alerts”
Well done! Switch is on
Your Camera LED will flash if you receive notifications or alerts