For Nokia Lumia 900 from AT&T USA, if code is NOT working:
The workaround is this: Enter the incorrect code until you run out of your ten (10) attempts. Then you'll get the *real* network unlock message, with 32 attempts. Enter the same 8-digit code you've been entering,
Watch: http://www.youtube.com/watch?v=8SO5ZXQy1zM
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