This is from a comedy site, but they do link to facts.
The article- http://www.cracked.com/article_18377_5-reasons-you-should-be-scared-apple_p2.html
From the article...
...."in October of 2009, a new application from Apple landed in the U.S. Patent Office. Apple's idea was to program devices to periodically interrupt users with unskippable ads. The ads would temporarily halt performance of the device in order to "compel attention." That on its own is pretty nightmarish but, innovators that they are, Apple found a way to crank it up to that hard-to-reach "Lovecraftian" level.
"Apple can further determine whether a user pays attention to the advertisement. The determination can include performing, while the advertisement is presented, an operation that urges the user to respond; and detecting whether the user responds to the performed operation. If the response is inappropriate or nonexistent, the system will go into lock down mode in some form or other until the user complies. In the case of an iPod, the sound could be disconnected rendering it useless until compliance is met. For the iPhone, no calls will be able to be made or received."