If you go to the official Need For Speed Undercover N-Gage site, you'll see a competition section labelled "coming soon". Try clicking on the words "coming soon", and you'll see a contest which tells you how to get free activation codes for Pro Series Golf, Mile High Pinball or Reset Generation. According to the n-gage.com NFSU game page, the code you require is NE3D 4 5P33D, though the prank form says NE3D 4 S433D. (via mavilacivert on the Arena forums) (UPDATE: It appears that the competition has been taken down as the "coming soon" link no longer works. We suspect they activated the link too early, as a lot of people couldn't get the codes to work.)