I found a cool application found on CYIDA for your iPhone 4.
It allows you to enable the LED on your iPhone 4 as a flashlight.
On Cydia -> Search for SpringFlash
Once you install it, you will have something called ACTIVATOR in your Settings.
Open Activator -> Anywhere -> and pick which button you want as your flashlight button. I chose double press Sleep Button.
Assign SpringFlash to it, and your LED Flashlight will be working
It allows you to enable the LED on your iPhone 4 as a flashlight.
On Cydia -> Search for SpringFlash
Once you install it, you will have something called ACTIVATOR in your Settings.
Open Activator -> Anywhere -> and pick which button you want as your flashlight button. I chose double press Sleep Button.
Assign SpringFlash to it, and your LED Flashlight will be working

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