go to nokiausa.com (or your local nokia.com site) then click on view shopping cart at the top.
You may need to enter your zipcode, and then you will come to some phone. Click on the phone only option that is a little below the tab menu.
A popup screen will ask which carrier, and you want to be sure to check the "include unlocked phones" option. Then find the n810 click on buy and there you should have a purchase for asking for any coupons or gift numbers. The code is invalid for the coupon, and shows no balance in the gift card number. Yet folks have been buying these over the phone.

Argghh.... Oh the pain...

-Shawn

UPDATE: Called Nokia, and they said the device is available for purchase. So if it is Why is my code not working!!! I could have ordered it had I wanted to pay 479 +S&H (minus the secret discount. ) But I want the super special price that I thought this code would give me. What's going on?!?!