The application "Handy Light ", which can turn your iPhone into a real flashlight, was removed from the AppStore because it incorporated a hidden option which offered the possibility of transforming the iPhone 3G modemwithout to pay the operator and without jailbreak. The application is no longer available on the App Store, it is therefore essential to have a Jailbroken iPhone to install the kernel. Here's the trick to turn on the modem on your iPhone.