A security hole has been discovered in the iOS 4.1 operating system that makes it possible to make calls on the iPhone even when the device is locked.
The bug, which emerged on MacRumors forums, works on both non-jailbroken and jailbroken iPhones and has been reported to Apple. According to MacStories.net website MacMagazine has a video detailing the bug.
The hole makes it possible to make calls with the passcode lock turned on by tapping on Emergency Call in the lower left corner of the screen and putting in a non-existent emergency number.
As that’s happening, users can then hit the sleep button and then be brought to the phone’s Contacts list and then make calls.
Various reports also suggest it is possible to send emails while in Locked mode, as well as access MMS.