Lock Now Free

来 Google Play 网购吧！购买内容之后，立刻就可以在您的 Android 手机或平板电脑上享用，摆脱一切同步烦恼。

Note: Disable force lock before updating or uninstalling.

See also

Using Google Apps Device Policy : Overview - Google Mobile Help

http://www.google.com/support/mobile/bin/answer.py?hl=en&answer=190930

On free version, setting screen is shown when unlocking one week after installation

Lock the terminal in a variety of ways,instead of pressing the endcall key

- Home screen Shortcut

- Search key,Call key long press

- USB disconnected

and other.