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Without a lot of fanfare, Apple has dropped the API, introduced six months ago, that detected and reported back whether or not an iPhone or other iOS device was jailbroken or not. It was part of bundle of mobile device management (MDM) API's released back in June with iOS4. But with the latest iOS 4.2, the API has either been removed or disabled.
No reason has been given for the change but it's understood that using the API would present a whole different game of cat and mouse. If the device has to be queried to tell whether it was jailbroken or not, hackers could easily circumvent the check or cause the device to give back false information.
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