If you are often in very loud places where you can’t hear your iPhone’s alerts signals or feel its vibrations, or if you’re in quiet places where noises and vibrations would be disruptive, here’s a way for your iPhone to get your attention boldly and quietly.
The Accessibility settings in iOS 5 offer a basketload of customizations for people with special needs such as poor vision or hearing. However, many of these settings can be useful for a lot of other purposes.
One of my favorites is the ability to use the camera’s LED flash as an additional alert whenever you receive a text or phone call.
To enable it, open the Settings app on your iPhone, then choose General, then Accesibility.
You’ll see an option called “LED Flash for Alerts” and you just need to turn it on. It’s that easy. Now your iPhone’s camera flash will give out several bright bursts of light every time you get an alert you don’t want to miss.