title: UIDevice currentDevice identifierForVendor - can this change on an iPad
body: <p>My app uses <code>UIDevice currentDevice identifierForVendor</code> to help me identify the device. Recently I have encountered a situation that I can't understand. A <code>UIDevice currentDevice identifierForVendor</code> of an iPad of one of my clients seems to have changed. Is this ever possible?</p>