How to Unlock the Nokia Lumia 800c

1. Switch ON your phone with a non accepted simcard
2. Phone will ask you to Enter Unlock Pin
3. Input the 8 digit Unlock Code

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,

ie: http://www.youtube.com/watch?v=8SO5ZXQy1zM

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