Last weekend I changed the ringtone on my Nokia 6600 to the Metal Gear Solid Codec call sound. Doesn't sound too out of place as a ringtone to people who don't know the game but it certainly gets a reaction from those who do. :)

Here's the MGS Codec Call Ringtone wave file I made if you'd like a copy for yourself. It's GSM encoded, mono, 22kHz. It's had the volume bumped up since it was coming out much too quiet to start with. Also, I've cut the end of it slightly since my phone has a slight pause between playing loops of a wave file. With the cut it plays back on my phone at about the same rhythm/spacing as in-game.

Edit: If my trimmed wave file isn't quite right for your phone, download the uncut, 16-bit PCM encoded, mono, 22KHz version to use and/or edit for yourself! If you're looking for a free tool to edit the wave file with I'd recommend the trial version of GoldWave.

Metal Gear Solid is © Konami Digital Entertainment Co., Ltd.