The Kill Switch is built within firmware 2.0. So it affect all gen iphones that's having firmware 2.0.

From iphonehacks:

Apple seems to have implemented this mechanism in iPhone firmware 2.0 to give them some control on iPhone Apps that have already been installed on the iPhone. We are guessing that Apple will use this mechanism only when they want to deactivate a malicious iPhone app.

Heard that iphone calls home(apple) once in a while too.

This post has been edited by davidgary73: Aug 13 2008, 02:23 PM

Sadly, piracy will always be around and this is the only first step for apple to make sure everything stay intact within apples domain/regulations.

I guess more security measures will be implemented on the coming firmware.