iCloud: Activation Lock
With iOS 7 or later, Find My iPhone includes a feature called Activation Lock, which is turned on automatically when you set up Find My iPhone. Activation Lock makes it harder for anyone to use or sell your iPhone, iPad, or iPod touch if it’s ever lost or stolen.
With Activation Lock, your Apple ID and password are required before anyone can:
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Turn off Find My iPhone on your device
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Sign out of iCloud on your device
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Erase and reactivate your device
If you want to give away or sell your device, be sure to erase your content and settings (in Settings > General > Reset > Erase All Content and Settings). When you erase your content, Find My iPhone and Activation Lock are also turned off.
If you no longer have the device, follow the instructions to remove a device you no longer have. For more information, see the Apple Support article What to do before selling or giving away your iPhone, iPad, or iPod touch.
For more information about Activation Lock, see the Apple Support article Find My iPhone Activation Lock in iOS 7.