One of the little known features of the iPhone is the ‘LED Flash for Alerts.’ When you enable this feature, the flash on the back of your iPhone will signal the notification that you have a message/call/etc. This prevents you from having to have the ringer turned up to the maximum position and it keeps you from checking your phone a hundred times a day because of those pesky phantom vibration sensations.
Activating the LED flash is really easy.
Go to ‘Settings,’ select the ‘General’ option. Scroll down to ‘Accessibility.’ Scroll again to the ‘HEARING’ menu and turn on the ‘LED Flash for Alerts’ option. You can now get quiet notifications or host a disco!
Click the images below for step-by-step screenshots of this process.