Android 4.1.2 - the new firmware for the Samsung Galaxy Note 2 contains an interesting security flaw.
1.Lock the device with a "secure" pattern, PIN, or password.
2.Activate the screen.
3.Press "Emergency Call".
4.Press the "ICE" button on the bottom left.
5.Hold down the physical home key for a few seconds and then release.
6.The phone's home screen will be displayed - briefly.
7.While the home screen is displayed, click on an app or a widget.
8.The app or widget will launch.
9.If the widget is "direct dial" the phone will start ringing.