Miguel Alvarado has found a glitch that lets users delete an iCloud account from an iOS 7.1 device without the Apple ID password. In this YouTube video, he demonstrates tapping the Delete Account button and the Find My iPhone switch simultaneously, then restarting the iPhone when the both prompts appear simultaneously. When the iPhone booted back up, he was free to remove the iCloud account, which disabled Find My iPhone. There’s some speculation that this may not affect all iPhone models; although we could replicate it on an iPhone 5s, we were unable to do so on an iPhone 5. Nonetheless, we hope Apple releases a fix soon, and in the meantime, make sure to use a passcode. follow link
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iOS 7.1 Vulnerability Lets Bad Guys Disable Find My iPhone