Activator based iPhone 4 LED flashlight. Default activation method is to double tap the power button. But you can assign any activator event to enable the LED torch for a bright LED flash light. To change the activation method, after installing and respringing, go to settings app, activator, and assign the flashlight to an action of your choice. Note: if you choose a different action such as power button hold or vol button up / down, make sure the device’s screen is on when you enable the light or you may have to reboot to get the light to come on again.