This works with Symbian, Windows mobile and Android phones
unfortunately does not list Iphone or blackberry.
Link: http://www.f-secure.com/en_US/products/mobile/anti-theft-for-mobile/index_main.html
The app itself does the following:
Remote lock
Remote locate
Remote wipe
SIM control (if SIM swapped, device locks, sends you their #)
Have heard good reviews of the app. Free cant hurt...
Rex.