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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.