PhoneBAK BlackBerry 2.0
the author of this app says:
With PhoneBAK you can stop worrying about what would happen if your BlackBerry is ever lost or stolen. PhoneBAK is anti-theft software that works quietly on your BlackBerry by automatically checking if the gadget is stolen. If it is, it sends the theif\'s contact number, location, and other details to help you get your BlackBerry back.