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
4.Unlock done
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Go to Settings > About > Reset your Phone (inster your lock code)
Turn off phone the Nokia Lumia 800
Press and hold the “Volume down“, “Power†and “Camera†buttons.
When the phone start vibrates release the “power buttonâ€.
Hold the “Volume down†and “camera†buttons for more than 10 secs and then release them.
Nokia 800 will reset and turn on.
or
Press and hold the “Power on†button for 10 seconds
The Nokia phone’s screen will turn black (the mobile is off)
Release the power button
You can turn on the Lumia now.