Here's what the official Prizes & Rewards page has to say about the contest:
The Charter Member Program is an exciting opportunity for you to play games and join in our community activities with your fellow Arena players, while earning points to win fun and amazing prizes, including one of 30 next generation N-Gage compatible devices.
But that's not all! The first 300 participants reaching 125 Charter Points will receive a voucher for a free next generation N-Gage game and receive Silver status in the Charter Member Program!
Reach 250 Charter Points and receive Gold status! The top-scoring 30 participants exceeding 250 Charter Points will qualify to win one of the next generation N-Gage compatible devices!
Every Charter Member will also earn a place of status in the next generation N-Gage community, but the higher status in the Charter Member Program you acquire, the bigger and better head start you will have!
We will be announcing which devices will be up for prizes soon, so stay tuned!