A graphic adventure game called Hidden Expedition: Titanic has been released for N-Gage-compatible phones, which involves exploring the wreck of the famous liner. You can find out more about the game and buy it from the official site. (All N-Gage phones are compatible with Symbian S60 3rd Edition games, so that's the version you should get.)

In vertical/portrait mode (240x320):

In horizontal/landscape mode (320x240):