I don't know if this has been posted yet, but I know there have been some questions about SIM card swapping with the iPhone to other devices. I was able to swap my new iTunes activated SIM card from my iPhone into my Razr (already had AT&T service) and my Razr worked fine. I know some people swap between multiple phones for different uses. I don't know if anyone has tried to put the new SIM card into a blackberry, but it does work on a Razr.