Apple has apparently included a blacklisting mechanism in iPhone OS 2.x through which the device can phone home, check for unauthorized applications, and disable them. The OS includes a URL that points to a page containing a list of unauthorized applications, specifically those listed here.
According to Jonathan Zdziarski, author of the book iPhone Open Application Development and an iPhone forensics manual:
This suggests that the iPhone calls home once in a while to find out what applications it should turn off. At the moment, no apps have been blacklisted, but by all appearances, this has been added to … Read more