Ok, open up Erix and wait on the main menu. Press EITHER 789 or 123 depending on the model of your phone. You should come up with a snake game! Press yes to start :)
A shameless cut'n'paste from the following page:
http://www.infosync.no/show.php?id=1227&page=1
(infosync rocks!)
The first of the games is Snake, which can be summoned by going to Menu/Fun & Games/Games/ERIX, selecting New Game, choosing any difficulty...
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