Tip: Many Android devices let you add a custom message to your lock screen. That's a great place to put emergency info, in case people don't know how to access it otherwise.

It replaces your default Android lock screen and removes the emergency call feature. It lets you set up a 4-digit passcode and choose a beautiful wallpaper for your screen.

A screen-lock circumvention vulnerability exists in Samsung devices running Android version 4.1.2 that could give unauthenticated users the ability to view the home screen, run apps there, and ...

Tested on an Samsung Galaxy Note II with Android 4.1.2, an attacker can bypass the device's lock screen, albeit momentarily, to access functions and view data on the device.