Reset Blackberry Handled to Factory Settings.

To reset the Blackberry Handled factory setings.

You can also remove the IT policy by using the loader.exe application included with BlackBerry Desktop Manager 4.7 to 6.0 on a Windows based computer.
Warning: This procedure deletes all data on the BlackBerry smartphone. Back up the data before performing this procedure. For more information on how to back up data, see KB12487.

Procedure:
Connect the BlackBerry smartphone to the computer.
From the Start menu, click Programs > Accessories > Command Prompt.
Note: When a computer running Windows Vista™ or Windows 7 is used, the BlackBerry smartphone user might need to right-click the Command Prompt application and choose Run as administrator.
Find the Apploader folder by typing cd C:\Program Files\Common Files\Research In Motion\Apploader and then pressing ENTER.
Note: For computers using a 64-bit version of Windows, navigate to C:\Program Files (x86)\Common Files\Research In Motion\Apploader.
Type loader.exe /resettofactory.
Type the BlackBerry smartphone password if prompted.

For more details, please refer the KB article: http://www.blackberry.com/btsc/microsites/KB14202