What app is the flashlight text thing for iPhone?

I have an iPhone 4S and you know on the iPhones when someone text you there's like a flash the goes off? How to you turn that on? Is it an app or it in the settings?

Go to settings, go into general, scroll down to accessibility, scroll down to LED flash for alerts. That should work. Hope this helped. Have a good day!

Settings > General > Accessibility > LED Flash for Alerts > ON

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