Samsung's Reactivation lock, also known as Factory Reset Protection (FRP), is a security feature available on all devices running Lollipop 5.1 or higher preventing others from activating the device if it's ever reported lost or stolen.
With Reactivation lock enabled, the owner of the cell phone will be required to type in their Samsung account username and password prior to factory resetting the device.
This feature is not the same as the PIN or password required to access the device when it has been turned off or due to a period of inactivity.
If you wish to activate this feature on your Samsung Galaxy, please follow the steps below:
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From the Home screen, tap Apps.
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Go to Settings.
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Touch the PERSONAL tab.
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Tap Lock screen and security.
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Click Find My Mobile.
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To turn the Reactivation lock on move the slider to off.
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Review the message that appears on the screen and press OK.
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When resetting your device, you will be prompted to confirm your Samsung account password.
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Your device will reboot and reset.
Samsung's Reactivation lock is similar to Apple's Find My iPhone Activation lock or iCloud lock in that only the original owner can deactivate this security feature.
You can network unlock your Samsung via IMEI for use on any compatible network in the world by clicking on the link below. You will be taken to the Samsung unlocking page where all you need to do is complete a short online form to submit your request: