iPhone OS 4.0 has a built in Flashlight

MacStories reader Nik Treiber has found out an interesting feature in the latest iPhone OS 4.0 beta 4. When you push the on/off button three times in a row while in the lockscreen, the iPhone goes in Flashlight mode. We aren't sure if this is a feature or bug, but it certainly would be quite useful.

Check out the video: