Is there any free iphone imei unlocker?

Some websites claim to unlock the iphone for free thru imei method.
Are any of them real or are they all scams?

Some exemples I came across:
http://unlockmydevice.co/unlocker/
www.phonefreedom.us

They are scams. Unlocking a iphone for free is not possible.
you must know someone who knows how.
please contact me for more info
gemcity@rocketmail.com

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