Originally Posted by
acerace113 I thought you need to set a passcode when you have find my iPhone turned on...
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You need to know the Apple ID and associated passcode of the person whose device you're trying to locate. In this regard, however, a person need to have physical access to your device, but if your device has a lockscreen passcode, this flaw is useless because the person doesn't have access to the settings menu to take advantage of the flaw.