AT&T - Nokia Lumia 1020 920 900 820 6790 Surge, C3 Slate, E62, E71x, N75, etc..

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*Important: If the Unlock Code provded is asking saying error, please continue to enter the unlock code provided until the phone asks for the "PUK" code.  Please don't worry about the attempts, once you have diminished all your tries, the phone will ask for the PUK code.  This is where you enter the Unlock Code. 

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