Want! I have actually used such a converted phone at 31c3. Someone from the Warpzone hackerspace in Münster, DE has built one. He even managed the trickery to d

Want! I have actually used such a converted phone at 31c3. Someone from the Warpzone hackerspace in Münster, DE has built one. He even managed the trickery to drive the original ringer with a simple battery.