An iPhone hacker claims Apple has added a "call home" feature to the iPhone which allows the firm to remotely disable "unauthorized" applications from your iPhone:
According to iPhone Atlas and iPhone hacker-extraordinaire Jonathan Zdziarski, Apple has readied a blacklisting system which allows the company to remotely disable applications on your device. Apparently, the new 2.x firmware contains a URL which points to a page containing a list of "unauthorized" apps -- a move which suggests that the device makes occasional contact with Apple's servers to see if anything is amiss on your phone. In Jonathan's words:
"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 disable applications that the user has already downloaded and paid for, if Apple so chooses to shut them down.
I discovered this doing a forensic examination of an iPhone 3G. It appears to be tucked away in a configuration file deep inside CoreLocation."