Smartphone security unlocking
Most of Smartphones have, by default, somehow restricted security. In short, it means unsigned applications cannot run or, if they are permited to run, they cannot run do priviledged operations (e.g. call restricted APIs, access protected registry keys).
By security locked Smartphone is mostly meant the device has set two tier security model, unsigned cabs cannot add protected settings and unsigned application must be explicitly allowed to run. To unlock that, security configuration needs to be changed. Security in Windows Mobile is controled by policies. Changing security policies can done by provisioning device or by manual change in the registry.
Major security policies:
More about security policies on Windows Mobile devices are available at MSDN
As the security policies registry key is protected the change in registry requires trusted registry editor. The one is available
here (you need to be a registered user in order to download files).
Unpack the zip archive and copy regeditSTG.exe to the device (e.g. using Activesync).