Now that the iPhone has flash we don't have to use our screens as a flashlight, and here are the steps to use the flash when ever you want to..
Open the camera app
Switch to video mode
Turn on flash on the top left corner
The screen will look like that^^
not to worry, everything is fine and now your flash is on and will stay on until you ether exit the camera app by pressing the home button or by shutting off the flash on the top left hand corner.. Enjoy!!
- Posted using my iPhone