There's a device for unlocking I-phones. I saw it in action a few times at work: The I-phone is placed horizontally into a cradle, 40 cm above the screen there's some kind of a device. That device produces flash flights, a couple times per second and I suspect it takes pictures. If I remember correctly there's nothing touching the buttons. The officer said that it can crack I-phone 6 (7 was not out when I asked it). What I suspect is that it uses brute force and avoids the delaying system. Since I work in a low tech environment, I was surprised to see that thing in action.