Read wiki site:
http://wiki.maemo.org/User:Marcus/Prey

I've lately messed with Prey to make it work at my N900 and it's basically working now.

It is recommended to manually install Prey, so look at the instructions on the wiki.

The INSTALLER.sh within the folder is an automated installer, which should hopefully work. If not, please help me fix it.
There are some dependencies that I've might left out, so report those as well.

If you got any questions or improvements to the INSTALLER.sh script etc., please do tell me.

EDIT: Haven't tried using it via cell phone connection, so I don't know at this point if that works.
EDIT2: Please note that all features aren't working at the moment. Haven't had time to fix them yet.