iPhone 4 is equipped with LED Flash light which is built for taking snaps in low light conditions but you might want yo use it on a dark night as Flashlight. To turn the LED light into Flashlight take quite number of steps however in order to avoid that cumbersome activity Jailbreak community has come up with an app named FlashCam.
FlashCam 0.0.1 can be installed from Cydia using BigBoss repository for Free. When installation is done you will see two buttons on your lockscreen as snap above and by pressing the Flashlight would turn the LED on and Take Photo will activate Camera application of your choice. You can configure Camera options from Settings menu of iPhone and goto Flash Cam. You can select Camera+, Panoramatic or Native Camera as selection for Take Photo button of FlashCam.
You can choose the location of display buttons on lockscreen and other configurable options like Lock when done, Lock sounds, passcode and use background etc. Accessibility to such important features must be quick and for that Apple also incorporates quick camera access button in iOS 5 Betas.
FlashCam is a free Cydia Application which you can install it using the procedure here.
In order to enjoy these Applications and Tweaks you need to Jailbreak so you might like to see Redsn0w Jailbreak & JailbreakMe or to Jailbreak while preserving your baseband (software unlock) see TinyUmbrella, SnowBreeze & PwnageTool.
For more stuff check out our Jailbreak Apps & Tweaks Gallery for iPhone/iPod, Themes Gallery for iPhone/iPod,Games Gallary for iPhone/iPod & Appstore Apps Gallery for iPhone/iPod.