There are many flashlight apps out there, so why get this one ? It is simple and well designed launch it and get light instantly by pressing one button uses the integrated FlashLight (iPhone 4 only) also uses your full screen as a light source (works on all devices) it is FREE! Try it. It's simply the best at what it does. Disclaimer: Continued use of the FlashLight on iPhone 4 may dramatically decrease battery life.
