Most importantly, the flashlight on your cellphone is simply not bright enough to provide you enough light if you were to need it for self-defense. Evil hides in the dark and a quality flashlight will enable you to identify threats hiding in the dark and possibly retreat before they have a chance to strike.The primary purpose of a flashlight is to provide you light in darkness whether its finding you the right key, looking for something under the car, sofa, or bed, hiking at night or an emergency light source during a power-outage, you will always have a use for a flashlight in your pocket.