This functionality has existed in the iPhone since launch. It was confirmed in a wall street journal interview with Steve Jobs on 11 Aug 2008.
Apple raised hackles in computer-privacy and security circles when an independent engineer discovered code inside the iPhone that suggested iPhones routinely check an Apple Web site that could, in theory trigger the removal of the undesirable software from the devices.
Mr. Jobs confirmed such a capability exists, but argued that Apple needs it in case it inadvertently allows a malicious program -- one that stole users' personal data, for example -- to be distributed to iPhones through the App Store. "Hopefully we never have to pull that lever, but we would be irresponsible not to have a lever like that to pull," he says.
This patent also would need to address the existing patent from Microsoft US 7516478 B2 Remote management of mobile devices